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ab841160 OW |
1 | /* |
2 | * | |
3 | * Intel Management Engine Interface (Intel MEI) Linux driver | |
4 | * Copyright (c) 2003-2011, Intel Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | */ | |
16 | ||
ab841160 OW |
17 | #include <linux/module.h> |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/aio.h> | |
26 | #include <linux/pci.h> | |
27 | #include <linux/poll.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/ioctl.h> | |
30 | #include <linux/cdev.h> | |
ab841160 OW |
31 | #include <linux/sched.h> |
32 | #include <linux/uuid.h> | |
33 | #include <linux/compat.h> | |
34 | #include <linux/jiffies.h> | |
35 | #include <linux/interrupt.h> | |
36 | ||
37 | #include "mei_dev.h" | |
38 | #include "mei.h" | |
39 | #include "interface.h" | |
40 | #include "mei_version.h" | |
41 | ||
42 | ||
43 | #define MEI_READ_TIMEOUT 45 | |
44 | #define MEI_DRIVER_NAME "mei" | |
45 | #define MEI_DEV_NAME "mei" | |
46 | ||
47 | /* | |
48 | * mei driver strings | |
49 | */ | |
50 | static char mei_driver_name[] = MEI_DRIVER_NAME; | |
51 | static const char mei_driver_string[] = "Intel(R) Management Engine Interface"; | |
52 | static const char mei_driver_version[] = MEI_DRIVER_VERSION; | |
53 | ||
54 | /* mei char device for registration */ | |
55 | static struct cdev mei_cdev; | |
56 | ||
57 | /* major number for device */ | |
58 | static int mei_major; | |
59 | /* The device pointer */ | |
60 | /* Currently this driver works as long as there is only a single AMT device. */ | |
61 | static struct pci_dev *mei_device; | |
62 | ||
63 | static struct class *mei_class; | |
64 | ||
65 | ||
66 | /* mei_pci_tbl - PCI Device ID Table */ | |
67 | static DEFINE_PCI_DEVICE_TABLE(mei_pci_tbl) = { | |
68 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)}, | |
69 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)}, | |
70 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)}, | |
71 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)}, | |
72 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)}, | |
73 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)}, | |
74 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)}, | |
75 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)}, | |
76 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)}, | |
77 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)}, | |
78 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)}, | |
79 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)}, | |
80 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)}, | |
81 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)}, | |
82 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)}, | |
83 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)}, | |
84 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)}, | |
85 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)}, | |
86 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)}, | |
87 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)}, | |
88 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)}, | |
89 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)}, | |
90 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)}, | |
91 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)}, | |
92 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)}, | |
93 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)}, | |
94 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)}, | |
95 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)}, | |
96 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)}, | |
97 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)}, | |
98 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)}, | |
99 | ||
100 | /* required last entry */ | |
101 | {0, } | |
102 | }; | |
103 | ||
104 | MODULE_DEVICE_TABLE(pci, mei_pci_tbl); | |
105 | ||
106 | static DEFINE_MUTEX(mei_mutex); | |
107 | ||
108 | /** | |
109 | * mei_probe - Device Initialization Routine | |
110 | * | |
111 | * @pdev: PCI device structure | |
112 | * @ent: entry in kcs_pci_tbl | |
113 | * | |
114 | * returns 0 on success, <0 on failure. | |
115 | */ | |
116 | static int __devinit mei_probe(struct pci_dev *pdev, | |
117 | const struct pci_device_id *ent) | |
118 | { | |
119 | struct mei_device *dev; | |
120 | int err; | |
121 | ||
122 | mutex_lock(&mei_mutex); | |
123 | if (mei_device) { | |
124 | err = -EEXIST; | |
125 | goto end; | |
126 | } | |
127 | /* enable pci dev */ | |
128 | err = pci_enable_device(pdev); | |
129 | if (err) { | |
130 | printk(KERN_ERR "mei: Failed to enable pci device.\n"); | |
131 | goto end; | |
132 | } | |
133 | /* set PCI host mastering */ | |
134 | pci_set_master(pdev); | |
135 | /* pci request regions for mei driver */ | |
136 | err = pci_request_regions(pdev, mei_driver_name); | |
137 | if (err) { | |
138 | printk(KERN_ERR "mei: Failed to get pci regions.\n"); | |
139 | goto disable_device; | |
140 | } | |
141 | /* allocates and initializes the mei dev structure */ | |
c95efb74 | 142 | dev = mei_device_init(pdev); |
ab841160 OW |
143 | if (!dev) { |
144 | err = -ENOMEM; | |
145 | goto release_regions; | |
146 | } | |
147 | /* mapping IO device memory */ | |
148 | dev->mem_addr = pci_iomap(pdev, 0, 0); | |
149 | if (!dev->mem_addr) { | |
150 | printk(KERN_ERR "mei: mapping I/O device memory failure.\n"); | |
151 | err = -ENOMEM; | |
152 | goto free_device; | |
153 | } | |
154 | /* request and enable interrupt */ | |
155 | err = request_threaded_irq(pdev->irq, | |
156 | mei_interrupt_quick_handler, | |
157 | mei_interrupt_thread_handler, | |
158 | IRQF_SHARED, mei_driver_name, dev); | |
159 | if (err) { | |
160 | printk(KERN_ERR "mei: request_threaded_irq failure. irq = %d\n", | |
161 | pdev->irq); | |
162 | goto unmap_memory; | |
163 | } | |
164 | INIT_DELAYED_WORK(&dev->wd_work, mei_wd_timer); | |
165 | if (mei_hw_init(dev)) { | |
166 | printk(KERN_ERR "mei: Init hw failure.\n"); | |
167 | err = -ENODEV; | |
168 | goto release_irq; | |
169 | } | |
170 | mei_device = pdev; | |
171 | pci_set_drvdata(pdev, dev); | |
172 | schedule_delayed_work(&dev->wd_work, HZ); | |
173 | ||
174 | mutex_unlock(&mei_mutex); | |
175 | ||
176 | pr_debug("mei: Driver initialization successful.\n"); | |
177 | ||
178 | return 0; | |
179 | ||
180 | release_irq: | |
181 | /* disable interrupts */ | |
182 | dev->host_hw_state = mei_hcsr_read(dev); | |
183 | mei_disable_interrupts(dev); | |
184 | flush_scheduled_work(); | |
185 | free_irq(pdev->irq, dev); | |
186 | unmap_memory: | |
187 | pci_iounmap(pdev, dev->mem_addr); | |
188 | free_device: | |
189 | kfree(dev); | |
190 | release_regions: | |
191 | pci_release_regions(pdev); | |
192 | disable_device: | |
193 | pci_disable_device(pdev); | |
194 | end: | |
195 | mutex_unlock(&mei_mutex); | |
196 | printk(KERN_ERR "mei: Driver initialization failed.\n"); | |
197 | return err; | |
198 | } | |
199 | ||
200 | /** | |
201 | * mei_remove - Device Removal Routine | |
202 | * | |
203 | * @pdev: PCI device structure | |
204 | * | |
205 | * mei_remove is called by the PCI subsystem to alert the driver | |
206 | * that it should release a PCI device. | |
207 | */ | |
208 | static void __devexit mei_remove(struct pci_dev *pdev) | |
209 | { | |
210 | struct mei_device *dev; | |
211 | ||
212 | if (mei_device != pdev) | |
213 | return; | |
214 | ||
215 | dev = pci_get_drvdata(pdev); | |
216 | if (!dev) | |
217 | return; | |
218 | ||
219 | mutex_lock(&dev->device_lock); | |
220 | ||
221 | mei_wd_stop(dev, false); | |
222 | ||
223 | mei_device = NULL; | |
224 | ||
225 | if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) { | |
226 | dev->iamthif_cl.state = MEI_FILE_DISCONNECTING; | |
227 | mei_disconnect_host_client(dev, &dev->iamthif_cl); | |
228 | } | |
229 | if (dev->wd_cl.state == MEI_FILE_CONNECTED) { | |
230 | dev->wd_cl.state = MEI_FILE_DISCONNECTING; | |
231 | mei_disconnect_host_client(dev, &dev->wd_cl); | |
232 | } | |
233 | ||
234 | /* remove entry if already in list */ | |
235 | dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n"); | |
236 | mei_remove_client_from_file_list(dev, dev->wd_cl.host_client_id); | |
237 | mei_remove_client_from_file_list(dev, dev->iamthif_cl.host_client_id); | |
238 | ||
239 | dev->iamthif_current_cb = NULL; | |
cf9673da | 240 | dev->me_clients_num = 0; |
ab841160 OW |
241 | |
242 | mutex_unlock(&dev->device_lock); | |
243 | ||
244 | flush_scheduled_work(); | |
245 | ||
246 | /* disable interrupts */ | |
247 | mei_disable_interrupts(dev); | |
248 | ||
249 | free_irq(pdev->irq, dev); | |
250 | pci_set_drvdata(pdev, NULL); | |
251 | ||
252 | if (dev->mem_addr) | |
253 | pci_iounmap(pdev, dev->mem_addr); | |
254 | ||
255 | kfree(dev); | |
256 | ||
257 | pci_release_regions(pdev); | |
258 | pci_disable_device(pdev); | |
259 | } | |
260 | ||
261 | /** | |
262 | * mei_clear_list - removes all callbacks associated with file | |
263 | * from mei_cb_list | |
264 | * | |
265 | * @dev: device structure. | |
266 | * @file: file structure | |
267 | * @mei_cb_list: callbacks list | |
268 | * | |
269 | * mei_clear_list is called to clear resources associated with file | |
270 | * when application calls close function or Ctrl-C was pressed | |
271 | * | |
272 | * returns true if callback removed from the list, false otherwise | |
273 | */ | |
274 | static bool mei_clear_list(struct mei_device *dev, | |
275 | struct file *file, struct list_head *mei_cb_list) | |
276 | { | |
277 | struct mei_cl_cb *cb_pos = NULL; | |
278 | struct mei_cl_cb *cb_next = NULL; | |
279 | struct file *file_temp; | |
280 | bool removed = false; | |
281 | ||
282 | /* list all list member */ | |
283 | list_for_each_entry_safe(cb_pos, cb_next, mei_cb_list, cb_list) { | |
284 | file_temp = (struct file *)cb_pos->file_object; | |
285 | /* check if list member associated with a file */ | |
286 | if (file_temp == file) { | |
287 | /* remove member from the list */ | |
288 | list_del(&cb_pos->cb_list); | |
289 | /* check if cb equal to current iamthif cb */ | |
290 | if (dev->iamthif_current_cb == cb_pos) { | |
291 | dev->iamthif_current_cb = NULL; | |
292 | /* send flow control to iamthif client */ | |
293 | mei_send_flow_control(dev, &dev->iamthif_cl); | |
294 | } | |
295 | /* free all allocated buffers */ | |
296 | mei_free_cb_private(cb_pos); | |
297 | cb_pos = NULL; | |
298 | removed = true; | |
299 | } | |
300 | } | |
301 | return removed; | |
302 | } | |
303 | ||
304 | /** | |
305 | * mei_clear_lists - removes all callbacks associated with file | |
306 | * | |
307 | * @dev: device structure | |
308 | * @file: file structure | |
309 | * | |
310 | * mei_clear_lists is called to clear resources associated with file | |
311 | * when application calls close function or Ctrl-C was pressed | |
312 | * | |
313 | * returns true if callback removed from the list, false otherwise | |
314 | */ | |
315 | static bool mei_clear_lists(struct mei_device *dev, struct file *file) | |
316 | { | |
317 | bool removed = false; | |
318 | ||
319 | /* remove callbacks associated with a file */ | |
320 | mei_clear_list(dev, file, &dev->amthi_cmd_list.mei_cb.cb_list); | |
321 | if (mei_clear_list(dev, file, | |
322 | &dev->amthi_read_complete_list.mei_cb.cb_list)) | |
323 | removed = true; | |
324 | ||
325 | mei_clear_list(dev, file, &dev->ctrl_rd_list.mei_cb.cb_list); | |
326 | ||
327 | if (mei_clear_list(dev, file, &dev->ctrl_wr_list.mei_cb.cb_list)) | |
328 | removed = true; | |
329 | ||
330 | if (mei_clear_list(dev, file, &dev->write_waiting_list.mei_cb.cb_list)) | |
331 | removed = true; | |
332 | ||
333 | if (mei_clear_list(dev, file, &dev->write_list.mei_cb.cb_list)) | |
334 | removed = true; | |
335 | ||
336 | /* check if iamthif_current_cb not NULL */ | |
337 | if (dev->iamthif_current_cb && !removed) { | |
338 | /* check file and iamthif current cb association */ | |
339 | if (dev->iamthif_current_cb->file_object == file) { | |
340 | /* remove cb */ | |
341 | mei_free_cb_private(dev->iamthif_current_cb); | |
342 | dev->iamthif_current_cb = NULL; | |
343 | removed = true; | |
344 | } | |
345 | } | |
346 | return removed; | |
347 | } | |
348 | /** | |
349 | * find_read_list_entry - find read list entry | |
350 | * | |
351 | * @dev: device structure | |
352 | * @file: pointer to file structure | |
353 | * | |
354 | * returns cb on success, NULL on error | |
355 | */ | |
356 | static struct mei_cl_cb *find_read_list_entry( | |
357 | struct mei_device *dev, | |
358 | struct mei_cl *cl) | |
359 | { | |
360 | struct mei_cl_cb *cb_pos = NULL; | |
361 | struct mei_cl_cb *cb_next = NULL; | |
ab841160 OW |
362 | |
363 | if (!dev->read_list.status && | |
364 | !list_empty(&dev->read_list.mei_cb.cb_list)) { | |
365 | ||
366 | dev_dbg(&dev->pdev->dev, "remove read_list CB\n"); | |
367 | list_for_each_entry_safe(cb_pos, cb_next, | |
368 | &dev->read_list.mei_cb.cb_list, cb_list) { | |
0288c7c9 TW |
369 | struct mei_cl *cl_temp; |
370 | cl_temp = (struct mei_cl *)cb_pos->file_private; | |
ab841160 | 371 | |
0288c7c9 | 372 | if (mei_cl_cmp_id(cl, cl_temp)) |
ab841160 | 373 | return cb_pos; |
ab841160 OW |
374 | } |
375 | } | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | /** | |
380 | * mei_open - the open function | |
381 | * | |
382 | * @inode: pointer to inode structure | |
383 | * @file: pointer to file structure | |
384 | * | |
385 | * returns 0 on success, <0 on error | |
386 | */ | |
387 | static int mei_open(struct inode *inode, struct file *file) | |
388 | { | |
389 | struct mei_cl *cl; | |
390 | int if_num = iminor(inode), err; | |
391 | struct mei_device *dev; | |
392 | ||
393 | err = -ENODEV; | |
394 | if (!mei_device) | |
395 | goto out; | |
396 | ||
397 | dev = pci_get_drvdata(mei_device); | |
398 | if (if_num != MEI_MINOR_NUMBER || !dev) | |
399 | goto out; | |
400 | ||
401 | mutex_lock(&dev->device_lock); | |
402 | err = -ENOMEM; | |
c95efb74 | 403 | cl = mei_cl_allocate(dev); |
ab841160 OW |
404 | if (!cl) |
405 | goto out; | |
406 | ||
407 | err = -ENODEV; | |
408 | if (dev->mei_state != MEI_ENABLED) { | |
409 | dev_dbg(&dev->pdev->dev, "mei_state != MEI_ENABLED mei_state= %d\n", | |
410 | dev->mei_state); | |
411 | goto out_unlock; | |
412 | } | |
413 | err = -EMFILE; | |
414 | if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) | |
415 | goto out_unlock; | |
416 | ||
417 | cl->host_client_id = find_first_zero_bit(dev->host_clients_map, | |
418 | MEI_CLIENTS_MAX); | |
419 | if (cl->host_client_id > MEI_CLIENTS_MAX) | |
420 | goto out_unlock; | |
421 | ||
422 | dev_dbg(&dev->pdev->dev, "client_id = %d\n", cl->host_client_id); | |
423 | ||
424 | dev->open_handle_count++; | |
425 | list_add_tail(&cl->link, &dev->file_list); | |
426 | ||
427 | set_bit(cl->host_client_id, dev->host_clients_map); | |
428 | cl->state = MEI_FILE_INITIALIZING; | |
429 | cl->sm_state = 0; | |
430 | ||
431 | file->private_data = cl; | |
432 | mutex_unlock(&dev->device_lock); | |
433 | ||
434 | return 0; | |
435 | ||
436 | out_unlock: | |
437 | mutex_unlock(&dev->device_lock); | |
438 | kfree(cl); | |
439 | out: | |
440 | return err; | |
441 | } | |
442 | ||
443 | /** | |
444 | * mei_release - the release function | |
445 | * | |
446 | * @inode: pointer to inode structure | |
447 | * @file: pointer to file structure | |
448 | * | |
449 | * returns 0 on success, <0 on error | |
450 | */ | |
451 | static int mei_release(struct inode *inode, struct file *file) | |
452 | { | |
453 | struct mei_cl *cl = file->private_data; | |
454 | struct mei_cl_cb *cb; | |
455 | struct mei_device *dev; | |
456 | int rets = 0; | |
457 | ||
458 | if (WARN_ON(!cl || !cl->dev)) | |
459 | return -ENODEV; | |
460 | ||
461 | dev = cl->dev; | |
462 | ||
463 | mutex_lock(&dev->device_lock); | |
464 | if (cl != &dev->iamthif_cl) { | |
465 | if (cl->state == MEI_FILE_CONNECTED) { | |
466 | cl->state = MEI_FILE_DISCONNECTING; | |
467 | dev_dbg(&dev->pdev->dev, | |
468 | "disconnecting client host client = %d, " | |
469 | "ME client = %d\n", | |
470 | cl->host_client_id, | |
471 | cl->me_client_id); | |
472 | rets = mei_disconnect_host_client(dev, cl); | |
473 | } | |
0288c7c9 | 474 | mei_cl_flush_queues(cl); |
ab841160 OW |
475 | dev_dbg(&dev->pdev->dev, "remove client host client = %d, ME client = %d\n", |
476 | cl->host_client_id, | |
477 | cl->me_client_id); | |
478 | ||
479 | if (dev->open_handle_count > 0) { | |
480 | clear_bit(cl->host_client_id, | |
481 | dev->host_clients_map); | |
482 | dev->open_handle_count--; | |
483 | } | |
484 | mei_remove_client_from_file_list(dev, cl->host_client_id); | |
485 | ||
486 | /* free read cb */ | |
487 | cb = NULL; | |
488 | if (cl->read_cb) { | |
489 | cb = find_read_list_entry(dev, cl); | |
490 | /* Remove entry from read list */ | |
491 | if (cb) | |
492 | list_del(&cb->cb_list); | |
493 | ||
494 | cb = cl->read_cb; | |
495 | cl->read_cb = NULL; | |
496 | } | |
497 | ||
498 | file->private_data = NULL; | |
499 | ||
500 | if (cb) { | |
501 | mei_free_cb_private(cb); | |
502 | cb = NULL; | |
503 | } | |
504 | ||
505 | kfree(cl); | |
506 | } else { | |
507 | if (dev->open_handle_count > 0) | |
508 | dev->open_handle_count--; | |
509 | ||
510 | if (dev->iamthif_file_object == file && | |
511 | dev->iamthif_state != MEI_IAMTHIF_IDLE) { | |
512 | ||
513 | dev_dbg(&dev->pdev->dev, "amthi canceled iamthif state %d\n", | |
514 | dev->iamthif_state); | |
eb9af0ac | 515 | dev->iamthif_canceled = true; |
ab841160 OW |
516 | if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) { |
517 | dev_dbg(&dev->pdev->dev, "run next amthi iamthif cb\n"); | |
c95efb74 | 518 | mei_run_next_iamthif_cmd(dev); |
ab841160 OW |
519 | } |
520 | } | |
521 | ||
522 | if (mei_clear_lists(dev, file)) | |
523 | dev->iamthif_state = MEI_IAMTHIF_IDLE; | |
524 | ||
525 | } | |
526 | mutex_unlock(&dev->device_lock); | |
527 | return rets; | |
528 | } | |
529 | ||
530 | ||
531 | /** | |
532 | * mei_read - the read function. | |
533 | * | |
534 | * @file: pointer to file structure | |
535 | * @ubuf: pointer to user buffer | |
536 | * @length: buffer length | |
537 | * @offset: data offset in buffer | |
538 | * | |
539 | * returns >=0 data length on success , <0 on error | |
540 | */ | |
541 | static ssize_t mei_read(struct file *file, char __user *ubuf, | |
542 | size_t length, loff_t *offset) | |
543 | { | |
544 | struct mei_cl *cl = file->private_data; | |
545 | struct mei_cl_cb *cb_pos = NULL; | |
546 | struct mei_cl_cb *cb = NULL; | |
547 | struct mei_device *dev; | |
548 | int i; | |
549 | int rets; | |
550 | int err; | |
551 | ||
552 | ||
553 | if (WARN_ON(!cl || !cl->dev)) | |
554 | return -ENODEV; | |
555 | ||
556 | dev = cl->dev; | |
557 | ||
558 | mutex_lock(&dev->device_lock); | |
559 | if (dev->mei_state != MEI_ENABLED) { | |
560 | rets = -ENODEV; | |
561 | goto out; | |
562 | } | |
563 | ||
564 | if ((cl->sm_state & MEI_WD_STATE_INDEPENDENCE_MSG_SENT) == 0) { | |
565 | /* Do not allow to read watchdog client */ | |
566 | i = mei_find_me_client_index(dev, mei_wd_guid); | |
567 | if (i >= 0) { | |
568 | struct mei_me_client *me_client = &dev->me_clients[i]; | |
569 | ||
570 | if (cl->me_client_id == me_client->client_id) { | |
571 | rets = -EBADF; | |
572 | goto out; | |
573 | } | |
574 | } | |
575 | } else { | |
576 | cl->sm_state &= ~MEI_WD_STATE_INDEPENDENCE_MSG_SENT; | |
577 | } | |
578 | ||
579 | if (cl == &dev->iamthif_cl) { | |
580 | rets = amthi_read(dev, file, ubuf, length, offset); | |
581 | goto out; | |
582 | } | |
583 | ||
584 | if (cl->read_cb && cl->read_cb->information > *offset) { | |
585 | cb = cl->read_cb; | |
586 | goto copy_buffer; | |
587 | } else if (cl->read_cb && cl->read_cb->information > 0 && | |
588 | cl->read_cb->information <= *offset) { | |
589 | cb = cl->read_cb; | |
590 | rets = 0; | |
591 | goto free; | |
592 | } else if ((!cl->read_cb || !cl->read_cb->information) && | |
593 | *offset > 0) { | |
594 | /*Offset needs to be cleaned for contingous reads*/ | |
595 | *offset = 0; | |
596 | rets = 0; | |
597 | goto out; | |
598 | } | |
599 | ||
600 | err = mei_start_read(dev, cl); | |
601 | if (err && err != -EBUSY) { | |
602 | dev_dbg(&dev->pdev->dev, | |
603 | "mei start read failure with status = %d\n", err); | |
604 | rets = err; | |
605 | goto out; | |
606 | } | |
607 | ||
608 | if (MEI_READ_COMPLETE != cl->reading_state && | |
609 | !waitqueue_active(&cl->rx_wait)) { | |
610 | if (file->f_flags & O_NONBLOCK) { | |
611 | rets = -EAGAIN; | |
612 | goto out; | |
613 | } | |
614 | ||
615 | mutex_unlock(&dev->device_lock); | |
616 | ||
617 | if (wait_event_interruptible(cl->rx_wait, | |
618 | (MEI_READ_COMPLETE == cl->reading_state || | |
619 | MEI_FILE_INITIALIZING == cl->state || | |
620 | MEI_FILE_DISCONNECTED == cl->state || | |
621 | MEI_FILE_DISCONNECTING == cl->state))) { | |
622 | if (signal_pending(current)) | |
623 | return -EINTR; | |
624 | return -ERESTARTSYS; | |
625 | } | |
626 | ||
627 | mutex_lock(&dev->device_lock); | |
628 | if (MEI_FILE_INITIALIZING == cl->state || | |
629 | MEI_FILE_DISCONNECTED == cl->state || | |
630 | MEI_FILE_DISCONNECTING == cl->state) { | |
631 | rets = -EBUSY; | |
632 | goto out; | |
633 | } | |
634 | } | |
635 | ||
636 | cb = cl->read_cb; | |
637 | ||
638 | if (!cb) { | |
639 | rets = -ENODEV; | |
640 | goto out; | |
641 | } | |
642 | if (cl->reading_state != MEI_READ_COMPLETE) { | |
643 | rets = 0; | |
644 | goto out; | |
645 | } | |
646 | /* now copy the data to user space */ | |
647 | copy_buffer: | |
648 | dev_dbg(&dev->pdev->dev, "cb->response_buffer size - %d\n", | |
649 | cb->response_buffer.size); | |
650 | dev_dbg(&dev->pdev->dev, "cb->information - %lu\n", | |
651 | cb->information); | |
652 | if (length == 0 || ubuf == NULL || *offset > cb->information) { | |
653 | rets = -EMSGSIZE; | |
654 | goto free; | |
655 | } | |
656 | ||
657 | /* length is being turncated to PAGE_SIZE, however, */ | |
658 | /* information size may be longer */ | |
659 | length = min_t(size_t, length, (cb->information - *offset)); | |
660 | ||
661 | if (copy_to_user(ubuf, | |
662 | cb->response_buffer.data + *offset, | |
663 | length)) { | |
664 | rets = -EFAULT; | |
665 | goto free; | |
666 | } | |
667 | ||
668 | rets = length; | |
669 | *offset += length; | |
670 | if ((unsigned long)*offset < cb->information) | |
671 | goto out; | |
672 | ||
673 | free: | |
674 | cb_pos = find_read_list_entry(dev, cl); | |
675 | /* Remove entry from read list */ | |
676 | if (cb_pos) | |
677 | list_del(&cb_pos->cb_list); | |
678 | mei_free_cb_private(cb); | |
679 | cl->reading_state = MEI_IDLE; | |
680 | cl->read_cb = NULL; | |
681 | cl->read_pending = 0; | |
682 | out: | |
683 | dev_dbg(&dev->pdev->dev, "end mei read rets= %d\n", rets); | |
684 | mutex_unlock(&dev->device_lock); | |
685 | return rets; | |
686 | } | |
687 | ||
688 | /** | |
689 | * mei_write - the write function. | |
690 | * | |
691 | * @file: pointer to file structure | |
692 | * @ubuf: pointer to user buffer | |
693 | * @length: buffer length | |
694 | * @offset: data offset in buffer | |
695 | * | |
696 | * returns >=0 data length on success , <0 on error | |
697 | */ | |
698 | static ssize_t mei_write(struct file *file, const char __user *ubuf, | |
699 | size_t length, loff_t *offset) | |
700 | { | |
701 | struct mei_cl *cl = file->private_data; | |
702 | struct mei_cl_cb *write_cb = NULL; | |
703 | struct mei_msg_hdr mei_hdr; | |
704 | struct mei_device *dev; | |
705 | unsigned long timeout = 0; | |
706 | int rets; | |
707 | int i; | |
708 | ||
709 | if (WARN_ON(!cl || !cl->dev)) | |
710 | return -ENODEV; | |
711 | ||
712 | dev = cl->dev; | |
713 | ||
714 | mutex_lock(&dev->device_lock); | |
715 | ||
716 | if (dev->mei_state != MEI_ENABLED) { | |
717 | mutex_unlock(&dev->device_lock); | |
718 | return -ENODEV; | |
719 | } | |
720 | ||
721 | if (cl == &dev->iamthif_cl) { | |
722 | write_cb = find_amthi_read_list_entry(dev, file); | |
723 | ||
724 | if (write_cb) { | |
725 | timeout = write_cb->read_time + | |
726 | msecs_to_jiffies(IAMTHIF_READ_TIMER); | |
727 | ||
728 | if (time_after(jiffies, timeout) || | |
729 | cl->reading_state == MEI_READ_COMPLETE) { | |
730 | *offset = 0; | |
731 | list_del(&write_cb->cb_list); | |
732 | mei_free_cb_private(write_cb); | |
733 | write_cb = NULL; | |
734 | } | |
735 | } | |
736 | } | |
737 | ||
738 | /* free entry used in read */ | |
739 | if (cl->reading_state == MEI_READ_COMPLETE) { | |
740 | *offset = 0; | |
741 | write_cb = find_read_list_entry(dev, cl); | |
742 | if (write_cb) { | |
743 | list_del(&write_cb->cb_list); | |
744 | mei_free_cb_private(write_cb); | |
745 | write_cb = NULL; | |
746 | cl->reading_state = MEI_IDLE; | |
747 | cl->read_cb = NULL; | |
748 | cl->read_pending = 0; | |
749 | } | |
750 | } else if (cl->reading_state == MEI_IDLE && | |
751 | !cl->read_pending) | |
752 | *offset = 0; | |
753 | ||
754 | ||
755 | write_cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL); | |
756 | if (!write_cb) { | |
757 | mutex_unlock(&dev->device_lock); | |
758 | return -ENOMEM; | |
759 | } | |
760 | ||
761 | write_cb->file_object = file; | |
762 | write_cb->file_private = cl; | |
763 | write_cb->request_buffer.data = kmalloc(length, GFP_KERNEL); | |
764 | rets = -ENOMEM; | |
765 | if (!write_cb->request_buffer.data) | |
766 | goto unlock_dev; | |
767 | ||
768 | dev_dbg(&dev->pdev->dev, "length =%d\n", (int) length); | |
769 | ||
770 | rets = -EFAULT; | |
771 | if (copy_from_user(write_cb->request_buffer.data, ubuf, length)) | |
772 | goto unlock_dev; | |
773 | ||
774 | cl->sm_state = 0; | |
775 | if (length == 4 && | |
776 | ((memcmp(mei_wd_state_independence_msg[0], | |
777 | write_cb->request_buffer.data, 4) == 0) || | |
778 | (memcmp(mei_wd_state_independence_msg[1], | |
779 | write_cb->request_buffer.data, 4) == 0) || | |
780 | (memcmp(mei_wd_state_independence_msg[2], | |
781 | write_cb->request_buffer.data, 4) == 0))) | |
782 | cl->sm_state |= MEI_WD_STATE_INDEPENDENCE_MSG_SENT; | |
783 | ||
784 | INIT_LIST_HEAD(&write_cb->cb_list); | |
785 | if (cl == &dev->iamthif_cl) { | |
786 | write_cb->response_buffer.data = | |
787 | kmalloc(dev->iamthif_mtu, GFP_KERNEL); | |
788 | if (!write_cb->response_buffer.data) { | |
789 | rets = -ENOMEM; | |
790 | goto unlock_dev; | |
791 | } | |
792 | if (dev->mei_state != MEI_ENABLED) { | |
793 | rets = -ENODEV; | |
794 | goto unlock_dev; | |
795 | } | |
cf9673da | 796 | for (i = 0; i < dev->me_clients_num; i++) { |
ab841160 OW |
797 | if (dev->me_clients[i].client_id == |
798 | dev->iamthif_cl.me_client_id) | |
799 | break; | |
800 | } | |
801 | ||
802 | if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) { | |
803 | rets = -ENODEV; | |
804 | goto unlock_dev; | |
805 | } | |
cf9673da | 806 | if (i == dev->me_clients_num || |
ab841160 OW |
807 | (dev->me_clients[i].client_id != |
808 | dev->iamthif_cl.me_client_id)) { | |
809 | rets = -ENODEV; | |
810 | goto unlock_dev; | |
811 | } else if (length > dev->me_clients[i].props.max_msg_length || | |
812 | length <= 0) { | |
813 | rets = -EMSGSIZE; | |
814 | goto unlock_dev; | |
815 | } | |
816 | ||
817 | write_cb->response_buffer.size = dev->iamthif_mtu; | |
818 | write_cb->major_file_operations = MEI_IOCTL; | |
819 | write_cb->information = 0; | |
820 | write_cb->request_buffer.size = length; | |
821 | if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) { | |
822 | rets = -ENODEV; | |
823 | goto unlock_dev; | |
824 | } | |
825 | ||
826 | if (!list_empty(&dev->amthi_cmd_list.mei_cb.cb_list) || | |
827 | dev->iamthif_state != MEI_IAMTHIF_IDLE) { | |
828 | dev_dbg(&dev->pdev->dev, "amthi_state = %d\n", | |
829 | (int) dev->iamthif_state); | |
830 | dev_dbg(&dev->pdev->dev, "add amthi cb to amthi cmd waiting list\n"); | |
831 | list_add_tail(&write_cb->cb_list, | |
832 | &dev->amthi_cmd_list.mei_cb.cb_list); | |
833 | rets = length; | |
834 | } else { | |
835 | dev_dbg(&dev->pdev->dev, "call amthi write\n"); | |
836 | rets = amthi_write(dev, write_cb); | |
837 | ||
838 | if (rets) { | |
839 | dev_dbg(&dev->pdev->dev, "amthi write failed with status = %d\n", | |
840 | rets); | |
841 | goto unlock_dev; | |
842 | } | |
843 | rets = length; | |
844 | } | |
845 | mutex_unlock(&dev->device_lock); | |
846 | return rets; | |
847 | } | |
848 | ||
849 | write_cb->major_file_operations = MEI_WRITE; | |
850 | /* make sure information is zero before we start */ | |
851 | ||
852 | write_cb->information = 0; | |
853 | write_cb->request_buffer.size = length; | |
854 | ||
855 | dev_dbg(&dev->pdev->dev, "host client = %d, ME client = %d\n", | |
856 | cl->host_client_id, cl->me_client_id); | |
857 | if (cl->state != MEI_FILE_CONNECTED) { | |
858 | rets = -ENODEV; | |
859 | dev_dbg(&dev->pdev->dev, "host client = %d, is not connected to ME client = %d", | |
860 | cl->host_client_id, | |
861 | cl->me_client_id); | |
862 | goto unlock_dev; | |
863 | } | |
cf9673da | 864 | for (i = 0; i < dev->me_clients_num; i++) { |
ab841160 OW |
865 | if (dev->me_clients[i].client_id == |
866 | cl->me_client_id) | |
867 | break; | |
868 | } | |
869 | if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) { | |
870 | rets = -ENODEV; | |
871 | goto unlock_dev; | |
872 | } | |
cf9673da | 873 | if (i == dev->me_clients_num) { |
ab841160 OW |
874 | rets = -ENODEV; |
875 | goto unlock_dev; | |
876 | } | |
877 | if (length > dev->me_clients[i].props.max_msg_length || length <= 0) { | |
878 | rets = -EINVAL; | |
879 | goto unlock_dev; | |
880 | } | |
881 | write_cb->file_private = cl; | |
882 | ||
883 | rets = mei_flow_ctrl_creds(dev, cl); | |
884 | if (rets < 0) | |
885 | goto unlock_dev; | |
886 | ||
887 | if (rets && dev->mei_host_buffer_is_empty) { | |
888 | rets = 0; | |
eb9af0ac | 889 | dev->mei_host_buffer_is_empty = false; |
ab841160 OW |
890 | if (length > ((((dev->host_hw_state & H_CBD) >> 24) * |
891 | sizeof(u32)) - sizeof(struct mei_msg_hdr))) { | |
892 | ||
893 | mei_hdr.length = | |
894 | (((dev->host_hw_state & H_CBD) >> 24) * | |
895 | sizeof(u32)) - | |
896 | sizeof(struct mei_msg_hdr); | |
897 | mei_hdr.msg_complete = 0; | |
898 | } else { | |
899 | mei_hdr.length = length; | |
900 | mei_hdr.msg_complete = 1; | |
901 | } | |
902 | mei_hdr.host_addr = cl->host_client_id; | |
903 | mei_hdr.me_addr = cl->me_client_id; | |
904 | mei_hdr.reserved = 0; | |
905 | dev_dbg(&dev->pdev->dev, "call mei_write_message header=%08x.\n", | |
906 | *((u32 *) &mei_hdr)); | |
907 | if (!mei_write_message(dev, &mei_hdr, | |
908 | (unsigned char *) (write_cb->request_buffer.data), | |
909 | mei_hdr.length)) { | |
910 | rets = -ENODEV; | |
911 | goto unlock_dev; | |
912 | } | |
913 | cl->writing_state = MEI_WRITING; | |
914 | write_cb->information = mei_hdr.length; | |
915 | if (mei_hdr.msg_complete) { | |
916 | if (mei_flow_ctrl_reduce(dev, cl)) { | |
917 | rets = -ENODEV; | |
918 | goto unlock_dev; | |
919 | } | |
920 | list_add_tail(&write_cb->cb_list, | |
921 | &dev->write_waiting_list.mei_cb.cb_list); | |
922 | } else { | |
923 | list_add_tail(&write_cb->cb_list, | |
924 | &dev->write_list.mei_cb.cb_list); | |
925 | } | |
926 | ||
927 | } else { | |
928 | ||
929 | write_cb->information = 0; | |
930 | cl->writing_state = MEI_WRITING; | |
931 | list_add_tail(&write_cb->cb_list, | |
932 | &dev->write_list.mei_cb.cb_list); | |
933 | } | |
934 | mutex_unlock(&dev->device_lock); | |
935 | return length; | |
936 | ||
937 | unlock_dev: | |
938 | mutex_unlock(&dev->device_lock); | |
939 | mei_free_cb_private(write_cb); | |
940 | return rets; | |
941 | } | |
942 | ||
943 | ||
944 | /** | |
945 | * mei_ioctl - the IOCTL function | |
946 | * | |
947 | * @file: pointer to file structure | |
948 | * @cmd: ioctl command | |
949 | * @data: pointer to mei message structure | |
950 | * | |
951 | * returns 0 on success , <0 on error | |
952 | */ | |
953 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
954 | { | |
955 | struct mei_device *dev; | |
956 | struct mei_cl *cl = file->private_data; | |
957 | struct mei_connect_client_data *connect_data = NULL; | |
958 | int rets; | |
959 | ||
960 | if (cmd != IOCTL_MEI_CONNECT_CLIENT) | |
961 | return -EINVAL; | |
962 | ||
963 | if (WARN_ON(!cl || !cl->dev)) | |
964 | return -ENODEV; | |
965 | ||
966 | dev = cl->dev; | |
967 | ||
968 | dev_dbg(&dev->pdev->dev, "IOCTL cmd = 0x%x", cmd); | |
969 | ||
970 | mutex_lock(&dev->device_lock); | |
971 | if (dev->mei_state != MEI_ENABLED) { | |
972 | rets = -ENODEV; | |
973 | goto out; | |
974 | } | |
975 | ||
976 | dev_dbg(&dev->pdev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); | |
977 | ||
978 | connect_data = kzalloc(sizeof(struct mei_connect_client_data), | |
979 | GFP_KERNEL); | |
980 | if (!connect_data) { | |
981 | rets = -ENOMEM; | |
982 | goto out; | |
983 | } | |
984 | dev_dbg(&dev->pdev->dev, "copy connect data from user\n"); | |
985 | if (copy_from_user(connect_data, (char __user *)data, | |
986 | sizeof(struct mei_connect_client_data))) { | |
987 | dev_dbg(&dev->pdev->dev, "failed to copy data from userland\n"); | |
988 | rets = -EFAULT; | |
989 | goto out; | |
990 | } | |
991 | rets = mei_ioctl_connect_client(file, connect_data); | |
992 | ||
993 | /* if all is ok, copying the data back to user. */ | |
994 | if (rets) | |
995 | goto out; | |
996 | ||
997 | dev_dbg(&dev->pdev->dev, "copy connect data to user\n"); | |
998 | if (copy_to_user((char __user *)data, connect_data, | |
999 | sizeof(struct mei_connect_client_data))) { | |
1000 | dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n"); | |
1001 | rets = -EFAULT; | |
1002 | goto out; | |
1003 | } | |
1004 | ||
1005 | out: | |
1006 | kfree(connect_data); | |
1007 | mutex_unlock(&dev->device_lock); | |
1008 | return rets; | |
1009 | } | |
1010 | ||
1011 | /** | |
1012 | * mei_compat_ioctl - the compat IOCTL function | |
1013 | * | |
1014 | * @file: pointer to file structure | |
1015 | * @cmd: ioctl command | |
1016 | * @data: pointer to mei message structure | |
1017 | * | |
1018 | * returns 0 on success , <0 on error | |
1019 | */ | |
1020 | #ifdef CONFIG_COMPAT | |
1021 | static long mei_compat_ioctl(struct file *file, | |
1022 | unsigned int cmd, unsigned long data) | |
1023 | { | |
1024 | return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); | |
1025 | } | |
1026 | #endif | |
1027 | ||
1028 | ||
1029 | /** | |
1030 | * mei_poll - the poll function | |
1031 | * | |
1032 | * @file: pointer to file structure | |
1033 | * @wait: pointer to poll_table structure | |
1034 | * | |
1035 | * returns poll mask | |
1036 | */ | |
1037 | static unsigned int mei_poll(struct file *file, poll_table *wait) | |
1038 | { | |
1039 | struct mei_cl *cl = file->private_data; | |
1040 | struct mei_device *dev; | |
1041 | unsigned int mask = 0; | |
1042 | ||
1043 | if (WARN_ON(!cl || !cl->dev)) | |
1044 | return mask; | |
1045 | ||
1046 | dev = cl->dev; | |
1047 | ||
1048 | mutex_lock(&dev->device_lock); | |
1049 | ||
1050 | if (dev->mei_state != MEI_ENABLED) | |
1051 | goto out; | |
1052 | ||
1053 | ||
1054 | if (cl == &dev->iamthif_cl) { | |
1055 | mutex_unlock(&dev->device_lock); | |
1056 | poll_wait(file, &dev->iamthif_cl.wait, wait); | |
1057 | mutex_lock(&dev->device_lock); | |
1058 | if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE && | |
1059 | dev->iamthif_file_object == file) { | |
1060 | mask |= (POLLIN | POLLRDNORM); | |
1061 | dev_dbg(&dev->pdev->dev, "run next amthi cb\n"); | |
c95efb74 | 1062 | mei_run_next_iamthif_cmd(dev); |
ab841160 OW |
1063 | } |
1064 | goto out; | |
1065 | } | |
1066 | ||
1067 | mutex_unlock(&dev->device_lock); | |
1068 | poll_wait(file, &cl->tx_wait, wait); | |
1069 | mutex_lock(&dev->device_lock); | |
1070 | if (MEI_WRITE_COMPLETE == cl->writing_state) | |
1071 | mask |= (POLLIN | POLLRDNORM); | |
1072 | ||
1073 | out: | |
1074 | mutex_unlock(&dev->device_lock); | |
1075 | return mask; | |
1076 | } | |
1077 | ||
1078 | #ifdef CONFIG_PM | |
1079 | static int mei_pci_suspend(struct device *device) | |
1080 | { | |
1081 | struct pci_dev *pdev = to_pci_dev(device); | |
1082 | struct mei_device *dev = pci_get_drvdata(pdev); | |
1083 | int err; | |
1084 | ||
1085 | if (!dev) | |
1086 | return -ENODEV; | |
1087 | mutex_lock(&dev->device_lock); | |
1088 | /* Stop watchdog if exists */ | |
1089 | err = mei_wd_stop(dev, true); | |
1090 | /* Set new mei state */ | |
1091 | if (dev->mei_state == MEI_ENABLED || | |
1092 | dev->mei_state == MEI_RECOVERING_FROM_RESET) { | |
1093 | dev->mei_state = MEI_POWER_DOWN; | |
1094 | mei_reset(dev, 0); | |
1095 | } | |
1096 | mutex_unlock(&dev->device_lock); | |
1097 | ||
1098 | free_irq(pdev->irq, dev); | |
1099 | ||
1100 | ||
1101 | return err; | |
1102 | } | |
1103 | ||
1104 | static int mei_pci_resume(struct device *device) | |
1105 | { | |
1106 | struct pci_dev *pdev = to_pci_dev(device); | |
1107 | struct mei_device *dev; | |
1108 | int err; | |
1109 | ||
1110 | dev = pci_get_drvdata(pdev); | |
1111 | if (!dev) | |
1112 | return -ENODEV; | |
1113 | ||
1114 | /* request and enable interrupt */ | |
1115 | err = request_threaded_irq(pdev->irq, | |
1116 | mei_interrupt_quick_handler, | |
1117 | mei_interrupt_thread_handler, | |
1118 | IRQF_SHARED, mei_driver_name, dev); | |
1119 | if (err) { | |
1120 | printk(KERN_ERR "mei: Request_irq failure. irq = %d\n", | |
1121 | pdev->irq); | |
1122 | return err; | |
1123 | } | |
1124 | ||
1125 | mutex_lock(&dev->device_lock); | |
1126 | dev->mei_state = MEI_POWER_UP; | |
1127 | mei_reset(dev, 1); | |
1128 | mutex_unlock(&dev->device_lock); | |
1129 | ||
1130 | /* Start watchdog if stopped in suspend */ | |
1131 | if (dev->wd_timeout) { | |
1132 | mei_wd_start_setup(dev); | |
1133 | dev->wd_due_counter = 1; | |
1134 | schedule_delayed_work(&dev->wd_work, HZ); | |
1135 | } | |
1136 | return err; | |
1137 | } | |
1138 | static SIMPLE_DEV_PM_OPS(mei_pm_ops, mei_pci_suspend, mei_pci_resume); | |
1139 | #define MEI_PM_OPS (&mei_pm_ops) | |
1140 | #else | |
2d990362 | 1141 | #define MEI_PM_OPS NULL |
ab841160 OW |
1142 | #endif /* CONFIG_PM */ |
1143 | /* | |
1144 | * PCI driver structure | |
1145 | */ | |
1146 | static struct pci_driver mei_driver = { | |
1147 | .name = mei_driver_name, | |
1148 | .id_table = mei_pci_tbl, | |
1149 | .probe = mei_probe, | |
1150 | .remove = __devexit_p(mei_remove), | |
1151 | .shutdown = __devexit_p(mei_remove), | |
1152 | .driver.pm = MEI_PM_OPS, | |
1153 | }; | |
1154 | ||
1155 | /* | |
1156 | * file operations structure will be used for mei char device. | |
1157 | */ | |
1158 | static const struct file_operations mei_fops = { | |
1159 | .owner = THIS_MODULE, | |
1160 | .read = mei_read, | |
1161 | .unlocked_ioctl = mei_ioctl, | |
1162 | #ifdef CONFIG_COMPAT | |
1163 | .compat_ioctl = mei_compat_ioctl, | |
1164 | #endif | |
1165 | .open = mei_open, | |
1166 | .release = mei_release, | |
1167 | .write = mei_write, | |
1168 | .poll = mei_poll, | |
1169 | }; | |
1170 | ||
1171 | /** | |
1172 | * mei_registration_cdev - sets up the cdev structure for mei device. | |
1173 | * | |
1174 | * @dev: char device struct | |
1175 | * @hminor: minor number for registration char device | |
1176 | * @fops: file operations structure | |
1177 | * | |
1178 | * returns 0 on success, <0 on failure. | |
1179 | */ | |
1180 | static int mei_registration_cdev(struct cdev *dev, int hminor, | |
1181 | const struct file_operations *fops) | |
1182 | { | |
1183 | int ret, devno = MKDEV(mei_major, hminor); | |
1184 | ||
1185 | cdev_init(dev, fops); | |
1186 | dev->owner = THIS_MODULE; | |
1187 | ret = cdev_add(dev, devno, 1); | |
1188 | /* Fail gracefully if need be */ | |
1189 | if (ret) | |
1190 | printk(KERN_ERR "mei: Error %d registering mei device %d\n", | |
1191 | ret, hminor); | |
1192 | return ret; | |
1193 | } | |
1194 | ||
1195 | /** | |
1196 | * mei_register_cdev - registers mei char device | |
1197 | * | |
1198 | * returns 0 on success, <0 on failure. | |
1199 | */ | |
1200 | static int mei_register_cdev(void) | |
1201 | { | |
1202 | int ret; | |
1203 | dev_t dev; | |
1204 | ||
1205 | /* registration of char devices */ | |
1206 | ret = alloc_chrdev_region(&dev, MEI_MINORS_BASE, MEI_MINORS_COUNT, | |
1207 | MEI_DRIVER_NAME); | |
1208 | if (ret) { | |
1209 | printk(KERN_ERR "mei: Error allocating char device region.\n"); | |
1210 | return ret; | |
1211 | } | |
1212 | ||
1213 | mei_major = MAJOR(dev); | |
1214 | ||
1215 | ret = mei_registration_cdev(&mei_cdev, MEI_MINOR_NUMBER, | |
1216 | &mei_fops); | |
1217 | if (ret) | |
1218 | unregister_chrdev_region(MKDEV(mei_major, MEI_MINORS_BASE), | |
1219 | MEI_MINORS_COUNT); | |
1220 | ||
1221 | return ret; | |
1222 | } | |
1223 | ||
1224 | /** | |
1225 | * mei_unregister_cdev - unregisters mei char device | |
1226 | */ | |
1227 | static void mei_unregister_cdev(void) | |
1228 | { | |
1229 | cdev_del(&mei_cdev); | |
1230 | unregister_chrdev_region(MKDEV(mei_major, MEI_MINORS_BASE), | |
1231 | MEI_MINORS_COUNT); | |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * mei_sysfs_device_create - adds device entry to sysfs | |
1236 | * | |
1237 | * returns 0 on success, <0 on failure. | |
1238 | */ | |
1239 | static int mei_sysfs_device_create(void) | |
1240 | { | |
1241 | struct class *class; | |
1242 | void *tmphdev; | |
1243 | int err; | |
1244 | ||
1245 | class = class_create(THIS_MODULE, MEI_DRIVER_NAME); | |
1246 | if (IS_ERR(class)) { | |
1247 | err = PTR_ERR(class); | |
1248 | printk(KERN_ERR "mei: Error creating mei class.\n"); | |
1249 | goto err_out; | |
1250 | } | |
1251 | ||
1252 | tmphdev = device_create(class, NULL, mei_cdev.dev, NULL, | |
1253 | MEI_DEV_NAME); | |
1254 | if (IS_ERR(tmphdev)) { | |
1255 | err = PTR_ERR(tmphdev); | |
1256 | goto err_destroy; | |
1257 | } | |
1258 | ||
1259 | mei_class = class; | |
1260 | return 0; | |
1261 | ||
1262 | err_destroy: | |
1263 | class_destroy(class); | |
1264 | err_out: | |
1265 | return err; | |
1266 | } | |
1267 | ||
1268 | /** | |
1269 | * mei_sysfs_device_remove - unregisters the device entry on sysfs | |
1270 | */ | |
1271 | static void mei_sysfs_device_remove(void) | |
1272 | { | |
1273 | if (IS_ERR_OR_NULL(mei_class)) | |
1274 | return; | |
1275 | ||
1276 | device_destroy(mei_class, mei_cdev.dev); | |
1277 | class_destroy(mei_class); | |
1278 | } | |
1279 | ||
1280 | /** | |
1281 | * mei_init_module - Driver Registration Routine | |
1282 | * | |
1283 | * mei_init_module is the first routine called when the driver is | |
1284 | * loaded. All it does is to register with the PCI subsystem. | |
1285 | * | |
1286 | * returns 0 on success, <0 on failure. | |
1287 | */ | |
1288 | static int __init mei_init_module(void) | |
1289 | { | |
1290 | int ret; | |
1291 | ||
1292 | pr_debug("mei: %s - version %s\n", | |
1293 | mei_driver_string, mei_driver_version); | |
1294 | /* init pci module */ | |
1295 | ret = pci_register_driver(&mei_driver); | |
1296 | if (ret < 0) { | |
1297 | printk(KERN_ERR "mei: Error registering driver.\n"); | |
1298 | goto end; | |
1299 | } | |
1300 | ||
1301 | ret = mei_register_cdev(); | |
1302 | if (ret) | |
1303 | goto unregister_pci; | |
1304 | ||
1305 | ret = mei_sysfs_device_create(); | |
1306 | if (ret) | |
1307 | goto unregister_cdev; | |
1308 | ||
1309 | return ret; | |
1310 | ||
1311 | unregister_cdev: | |
1312 | mei_unregister_cdev(); | |
1313 | unregister_pci: | |
1314 | pci_unregister_driver(&mei_driver); | |
1315 | end: | |
1316 | return ret; | |
1317 | } | |
1318 | ||
1319 | module_init(mei_init_module); | |
1320 | ||
1321 | /** | |
1322 | * mei_exit_module - Driver Exit Cleanup Routine | |
1323 | * | |
1324 | * mei_exit_module is called just before the driver is removed | |
1325 | * from memory. | |
1326 | */ | |
1327 | static void __exit mei_exit_module(void) | |
1328 | { | |
1329 | pci_unregister_driver(&mei_driver); | |
1330 | mei_sysfs_device_remove(); | |
1331 | mei_unregister_cdev(); | |
1332 | ||
1333 | pr_debug("mei: Driver unloaded successfully.\n"); | |
1334 | } | |
1335 | ||
1336 | module_exit(mei_exit_module); | |
1337 | ||
1338 | ||
1339 | MODULE_AUTHOR("Intel Corporation"); | |
1340 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
1341 | MODULE_LICENSE("GPL v2"); | |
1342 | MODULE_VERSION(MEI_DRIVER_VERSION); |