Commit | Line | Data |
---|---|---|
024f7f31 IPG |
1 | /* |
2 | * Intel Wireless WiMAX Connection 2400m | |
3 | * Generic probe/disconnect, reset and message passing | |
4 | * | |
5 | * | |
6 | * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com> | |
7 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License version | |
11 | * 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
21 | * 02110-1301, USA. | |
22 | * | |
23 | * | |
24 | * See i2400m.h for driver documentation. This contains helpers for | |
25 | * the driver model glue [_setup()/_release()], handling device resets | |
26 | * [_dev_reset_handle()], and the backends for the WiMAX stack ops | |
27 | * reset [_op_reset()] and message from user [_op_msg_from_user()]. | |
28 | * | |
29 | * ROADMAP: | |
30 | * | |
31 | * i2400m_op_msg_from_user() | |
32 | * i2400m_msg_to_dev() | |
33 | * wimax_msg_to_user_send() | |
34 | * | |
35 | * i2400m_op_reset() | |
36 | * i240m->bus_reset() | |
37 | * | |
38 | * i2400m_dev_reset_handle() | |
39 | * __i2400m_dev_reset_handle() | |
40 | * __i2400m_dev_stop() | |
41 | * __i2400m_dev_start() | |
42 | * | |
43 | * i2400m_setup() | |
44 | * i2400m_bootrom_init() | |
45 | * register_netdev() | |
46 | * i2400m_dev_start() | |
47 | * __i2400m_dev_start() | |
48 | * i2400m_dev_bootstrap() | |
49 | * i2400m_tx_setup() | |
50 | * i2400m->bus_dev_start() | |
51 | * i2400m_check_mac_addr() | |
52 | * wimax_dev_add() | |
53 | * | |
54 | * i2400m_release() | |
55 | * wimax_dev_rm() | |
56 | * i2400m_dev_stop() | |
57 | * __i2400m_dev_stop() | |
58 | * i2400m_dev_shutdown() | |
59 | * i2400m->bus_dev_stop() | |
60 | * i2400m_tx_release() | |
61 | * unregister_netdev() | |
62 | */ | |
63 | #include "i2400m.h" | |
64 | #include <linux/wimax/i2400m.h> | |
65 | #include <linux/module.h> | |
66 | #include <linux/moduleparam.h> | |
67 | ||
68 | #define D_SUBMODULE driver | |
69 | #include "debug-levels.h" | |
70 | ||
71 | ||
72 | int i2400m_idle_mode_disabled; /* 0 (idle mode enabled) by default */ | |
73 | module_param_named(idle_mode_disabled, i2400m_idle_mode_disabled, int, 0644); | |
74 | MODULE_PARM_DESC(idle_mode_disabled, | |
75 | "If true, the device will not enable idle mode negotiation " | |
76 | "with the base station (when connected) to save power."); | |
77 | ||
78 | /** | |
79 | * i2400m_queue_work - schedule work on a i2400m's queue | |
80 | * | |
81 | * @i2400m: device descriptor | |
82 | * | |
83 | * @fn: function to run to execute work. It gets passed a 'struct | |
84 | * work_struct' that is wrapped in a 'struct i2400m_work'. Once | |
85 | * done, you have to (1) i2400m_put(i2400m_work->i2400m) and then | |
86 | * (2) kfree(i2400m_work). | |
87 | * | |
88 | * @gfp_flags: GFP flags for memory allocation. | |
89 | * | |
90 | * @pl: pointer to a payload buffer that you want to pass to the _work | |
91 | * function. Use this to pack (for example) a struct with extra | |
92 | * arguments. | |
93 | * | |
94 | * @pl_size: size of the payload buffer. | |
95 | * | |
96 | * We do this quite often, so this just saves typing; allocate a | |
97 | * wrapper for a i2400m, get a ref to it, pack arguments and launch | |
98 | * the work. | |
99 | * | |
100 | * A usual workflow is: | |
101 | * | |
102 | * struct my_work_args { | |
103 | * void *something; | |
104 | * int whatever; | |
105 | * }; | |
106 | * ... | |
107 | * | |
108 | * struct my_work_args my_args = { | |
109 | * .something = FOO, | |
110 | * .whaetever = BLAH | |
111 | * }; | |
112 | * i2400m_queue_work(i2400m, 1, my_work_function, GFP_KERNEL, | |
113 | * &args, sizeof(args)) | |
114 | * | |
115 | * And now the work function can unpack the arguments and call the | |
116 | * real function (or do the job itself): | |
117 | * | |
118 | * static | |
119 | * void my_work_fn((struct work_struct *ws) | |
120 | * { | |
121 | * struct i2400m_work *iw = | |
122 | * container_of(ws, struct i2400m_work, ws); | |
123 | * struct my_work_args *my_args = (void *) iw->pl; | |
124 | * | |
125 | * my_work(iw->i2400m, my_args->something, my_args->whatevert); | |
126 | * } | |
127 | */ | |
128 | int i2400m_queue_work(struct i2400m *i2400m, | |
129 | void (*fn)(struct work_struct *), gfp_t gfp_flags, | |
130 | const void *pl, size_t pl_size) | |
131 | { | |
132 | int result; | |
133 | struct i2400m_work *iw; | |
134 | ||
135 | BUG_ON(i2400m->work_queue == NULL); | |
136 | result = -ENOMEM; | |
137 | iw = kzalloc(sizeof(*iw) + pl_size, gfp_flags); | |
138 | if (iw == NULL) | |
139 | goto error_kzalloc; | |
140 | iw->i2400m = i2400m_get(i2400m); | |
141 | memcpy(iw->pl, pl, pl_size); | |
142 | INIT_WORK(&iw->ws, fn); | |
143 | result = queue_work(i2400m->work_queue, &iw->ws); | |
144 | error_kzalloc: | |
145 | return result; | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(i2400m_queue_work); | |
148 | ||
149 | ||
150 | /* | |
151 | * Schedule i2400m's specific work on the system's queue. | |
152 | * | |
153 | * Used for a few cases where we really need it; otherwise, identical | |
154 | * to i2400m_queue_work(). | |
155 | * | |
156 | * Returns < 0 errno code on error, 1 if ok. | |
157 | * | |
158 | * If it returns zero, something really bad happened, as it means the | |
159 | * works struct was already queued, but we have just allocated it, so | |
160 | * it should not happen. | |
161 | */ | |
162 | int i2400m_schedule_work(struct i2400m *i2400m, | |
163 | void (*fn)(struct work_struct *), gfp_t gfp_flags) | |
164 | { | |
165 | int result; | |
166 | struct i2400m_work *iw; | |
167 | ||
168 | BUG_ON(i2400m->work_queue == NULL); | |
169 | result = -ENOMEM; | |
170 | iw = kzalloc(sizeof(*iw), gfp_flags); | |
171 | if (iw == NULL) | |
172 | goto error_kzalloc; | |
173 | iw->i2400m = i2400m_get(i2400m); | |
174 | INIT_WORK(&iw->ws, fn); | |
175 | result = schedule_work(&iw->ws); | |
176 | if (result == 0) | |
177 | result = -ENXIO; | |
178 | error_kzalloc: | |
179 | return result; | |
180 | } | |
181 | ||
182 | ||
183 | /* | |
184 | * WiMAX stack operation: relay a message from user space | |
185 | * | |
186 | * @wimax_dev: device descriptor | |
187 | * @pipe_name: named pipe the message is for | |
188 | * @msg_buf: pointer to the message bytes | |
189 | * @msg_len: length of the buffer | |
190 | * @genl_info: passed by the generic netlink layer | |
191 | * | |
192 | * The WiMAX stack will call this function when a message was received | |
193 | * from user space. | |
194 | * | |
195 | * For the i2400m, this is an L3L4 message, as specified in | |
196 | * include/linux/wimax/i2400m.h, and thus prefixed with a 'struct | |
197 | * i2400m_l3l4_hdr'. Driver (and device) expect the messages to be | |
198 | * coded in Little Endian. | |
199 | * | |
200 | * This function just verifies that the header declaration and the | |
201 | * payload are consistent and then deals with it, either forwarding it | |
202 | * to the device or procesing it locally. | |
203 | * | |
204 | * In the i2400m, messages are basically commands that will carry an | |
205 | * ack, so we use i2400m_msg_to_dev() and then deliver the ack back to | |
206 | * user space. The rx.c code might intercept the response and use it | |
207 | * to update the driver's state, but then it will pass it on so it can | |
208 | * be relayed back to user space. | |
209 | * | |
210 | * Note that asynchronous events from the device are processed and | |
211 | * sent to user space in rx.c. | |
212 | */ | |
213 | static | |
214 | int i2400m_op_msg_from_user(struct wimax_dev *wimax_dev, | |
215 | const char *pipe_name, | |
216 | const void *msg_buf, size_t msg_len, | |
217 | const struct genl_info *genl_info) | |
218 | { | |
219 | int result; | |
220 | struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev); | |
221 | struct device *dev = i2400m_dev(i2400m); | |
222 | struct sk_buff *ack_skb; | |
223 | ||
224 | d_fnstart(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p " | |
225 | "msg_len %zu genl_info %p)\n", wimax_dev, i2400m, | |
226 | msg_buf, msg_len, genl_info); | |
227 | ack_skb = i2400m_msg_to_dev(i2400m, msg_buf, msg_len); | |
228 | result = PTR_ERR(ack_skb); | |
229 | if (IS_ERR(ack_skb)) | |
230 | goto error_msg_to_dev; | |
231 | if (unlikely(i2400m->trace_msg_from_user)) | |
232 | wimax_msg(&i2400m->wimax_dev, "trace", | |
233 | msg_buf, msg_len, GFP_KERNEL); | |
234 | result = wimax_msg_send(&i2400m->wimax_dev, ack_skb); | |
235 | error_msg_to_dev: | |
236 | d_fnend(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p msg_len %zu " | |
237 | "genl_info %p) = %d\n", wimax_dev, i2400m, msg_buf, msg_len, | |
238 | genl_info, result); | |
239 | return result; | |
240 | } | |
241 | ||
242 | ||
243 | /* | |
244 | * Context to wait for a reset to finalize | |
245 | */ | |
246 | struct i2400m_reset_ctx { | |
247 | struct completion completion; | |
248 | int result; | |
249 | }; | |
250 | ||
251 | ||
252 | /* | |
253 | * WiMAX stack operation: reset a device | |
254 | * | |
255 | * @wimax_dev: device descriptor | |
256 | * | |
257 | * See the documentation for wimax_reset() and wimax_dev->op_reset for | |
258 | * the requirements of this function. The WiMAX stack guarantees | |
259 | * serialization on calls to this function. | |
260 | * | |
261 | * Do a warm reset on the device; if it fails, resort to a cold reset | |
262 | * and return -ENODEV. On successful warm reset, we need to block | |
263 | * until it is complete. | |
264 | * | |
265 | * The bus-driver implementation of reset takes care of falling back | |
266 | * to cold reset if warm fails. | |
267 | */ | |
268 | static | |
269 | int i2400m_op_reset(struct wimax_dev *wimax_dev) | |
270 | { | |
271 | int result; | |
272 | struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev); | |
273 | struct device *dev = i2400m_dev(i2400m); | |
274 | struct i2400m_reset_ctx ctx = { | |
275 | .completion = COMPLETION_INITIALIZER_ONSTACK(ctx.completion), | |
276 | .result = 0, | |
277 | }; | |
278 | ||
279 | d_fnstart(4, dev, "(wimax_dev %p)\n", wimax_dev); | |
280 | mutex_lock(&i2400m->init_mutex); | |
281 | i2400m->reset_ctx = &ctx; | |
282 | mutex_unlock(&i2400m->init_mutex); | |
283 | result = i2400m->bus_reset(i2400m, I2400M_RT_WARM); | |
284 | if (result < 0) | |
285 | goto out; | |
286 | result = wait_for_completion_timeout(&ctx.completion, 4*HZ); | |
287 | if (result == 0) | |
288 | result = -ETIMEDOUT; | |
289 | else if (result > 0) | |
290 | result = ctx.result; | |
291 | /* if result < 0, pass it on */ | |
292 | mutex_lock(&i2400m->init_mutex); | |
293 | i2400m->reset_ctx = NULL; | |
294 | mutex_unlock(&i2400m->init_mutex); | |
295 | out: | |
296 | d_fnend(4, dev, "(wimax_dev %p) = %d\n", wimax_dev, result); | |
297 | return result; | |
298 | } | |
299 | ||
300 | ||
301 | /* | |
302 | * Check the MAC address we got from boot mode is ok | |
303 | * | |
304 | * @i2400m: device descriptor | |
305 | * | |
306 | * Returns: 0 if ok, < 0 errno code on error. | |
307 | */ | |
308 | static | |
309 | int i2400m_check_mac_addr(struct i2400m *i2400m) | |
310 | { | |
311 | int result; | |
312 | struct device *dev = i2400m_dev(i2400m); | |
313 | struct sk_buff *skb; | |
314 | const struct i2400m_tlv_detailed_device_info *ddi; | |
315 | struct net_device *net_dev = i2400m->wimax_dev.net_dev; | |
316 | const unsigned char zeromac[ETH_ALEN] = { 0 }; | |
317 | ||
318 | d_fnstart(3, dev, "(i2400m %p)\n", i2400m); | |
319 | skb = i2400m_get_device_info(i2400m); | |
320 | if (IS_ERR(skb)) { | |
321 | result = PTR_ERR(skb); | |
322 | dev_err(dev, "Cannot verify MAC address, error reading: %d\n", | |
323 | result); | |
324 | goto error; | |
325 | } | |
326 | /* Extract MAC addresss */ | |
327 | ddi = (void *) skb->data; | |
328 | BUILD_BUG_ON(ETH_ALEN != sizeof(ddi->mac_address)); | |
329 | d_printf(2, dev, "GET DEVICE INFO: mac addr " | |
330 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
331 | ddi->mac_address[0], ddi->mac_address[1], | |
332 | ddi->mac_address[2], ddi->mac_address[3], | |
333 | ddi->mac_address[4], ddi->mac_address[5]); | |
334 | if (!memcmp(net_dev->perm_addr, ddi->mac_address, | |
335 | sizeof(ddi->mac_address))) | |
336 | goto ok; | |
337 | dev_warn(dev, "warning: device reports a different MAC address " | |
338 | "to that of boot mode's\n"); | |
339 | dev_warn(dev, "device reports %02x:%02x:%02x:%02x:%02x:%02x\n", | |
340 | ddi->mac_address[0], ddi->mac_address[1], | |
341 | ddi->mac_address[2], ddi->mac_address[3], | |
342 | ddi->mac_address[4], ddi->mac_address[5]); | |
343 | dev_warn(dev, "boot mode reported %02x:%02x:%02x:%02x:%02x:%02x\n", | |
344 | net_dev->perm_addr[0], net_dev->perm_addr[1], | |
345 | net_dev->perm_addr[2], net_dev->perm_addr[3], | |
346 | net_dev->perm_addr[4], net_dev->perm_addr[5]); | |
347 | if (!memcmp(zeromac, ddi->mac_address, sizeof(zeromac))) | |
348 | dev_err(dev, "device reports an invalid MAC address, " | |
349 | "not updating\n"); | |
350 | else { | |
351 | dev_warn(dev, "updating MAC address\n"); | |
352 | net_dev->addr_len = ETH_ALEN; | |
353 | memcpy(net_dev->perm_addr, ddi->mac_address, ETH_ALEN); | |
354 | memcpy(net_dev->dev_addr, ddi->mac_address, ETH_ALEN); | |
355 | } | |
356 | ok: | |
357 | result = 0; | |
358 | kfree_skb(skb); | |
359 | error: | |
360 | d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result); | |
361 | return result; | |
362 | } | |
363 | ||
364 | ||
365 | /** | |
366 | * __i2400m_dev_start - Bring up driver communication with the device | |
367 | * | |
368 | * @i2400m: device descriptor | |
369 | * @flags: boot mode flags | |
370 | * | |
371 | * Returns: 0 if ok, < 0 errno code on error. | |
372 | * | |
373 | * Uploads firmware and brings up all the resources needed to be able | |
374 | * to communicate with the device. | |
375 | * | |
376 | * TX needs to be setup before the bus-specific code (otherwise on | |
377 | * shutdown, the bus-tx code could try to access it). | |
378 | */ | |
379 | static | |
380 | int __i2400m_dev_start(struct i2400m *i2400m, enum i2400m_bri flags) | |
381 | { | |
382 | int result; | |
383 | struct wimax_dev *wimax_dev = &i2400m->wimax_dev; | |
384 | struct net_device *net_dev = wimax_dev->net_dev; | |
385 | struct device *dev = i2400m_dev(i2400m); | |
386 | int times = 3; | |
387 | ||
388 | d_fnstart(3, dev, "(i2400m %p)\n", i2400m); | |
389 | retry: | |
390 | result = i2400m_dev_bootstrap(i2400m, flags); | |
391 | if (result < 0) { | |
392 | dev_err(dev, "cannot bootstrap device: %d\n", result); | |
393 | goto error_bootstrap; | |
394 | } | |
395 | result = i2400m_tx_setup(i2400m); | |
396 | if (result < 0) | |
397 | goto error_tx_setup; | |
398 | result = i2400m->bus_dev_start(i2400m); | |
399 | if (result < 0) | |
400 | goto error_bus_dev_start; | |
401 | i2400m->work_queue = create_singlethread_workqueue(wimax_dev->name); | |
402 | if (i2400m->work_queue == NULL) { | |
403 | result = -ENOMEM; | |
404 | dev_err(dev, "cannot create workqueue\n"); | |
405 | goto error_create_workqueue; | |
406 | } | |
407 | /* At this point is ok to send commands to the device */ | |
408 | result = i2400m_check_mac_addr(i2400m); | |
409 | if (result < 0) | |
410 | goto error_check_mac_addr; | |
411 | i2400m->ready = 1; | |
412 | wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED); | |
413 | result = i2400m_dev_initialize(i2400m); | |
414 | if (result < 0) | |
415 | goto error_dev_initialize; | |
416 | /* At this point, reports will come for the device and set it | |
417 | * to the right state if it is different than UNINITIALIZED */ | |
418 | d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n", | |
419 | net_dev, i2400m, result); | |
420 | return result; | |
421 | ||
422 | error_dev_initialize: | |
423 | error_check_mac_addr: | |
424 | destroy_workqueue(i2400m->work_queue); | |
425 | error_create_workqueue: | |
426 | i2400m->bus_dev_stop(i2400m); | |
427 | error_bus_dev_start: | |
428 | i2400m_tx_release(i2400m); | |
429 | error_tx_setup: | |
430 | error_bootstrap: | |
431 | if (result == -ERESTARTSYS && times-- > 0) { | |
432 | flags = I2400M_BRI_SOFT; | |
433 | goto retry; | |
434 | } | |
435 | d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n", | |
436 | net_dev, i2400m, result); | |
437 | return result; | |
438 | } | |
439 | ||
440 | ||
441 | static | |
442 | int i2400m_dev_start(struct i2400m *i2400m, enum i2400m_bri bm_flags) | |
443 | { | |
444 | int result; | |
445 | mutex_lock(&i2400m->init_mutex); /* Well, start the device */ | |
446 | result = __i2400m_dev_start(i2400m, bm_flags); | |
447 | if (result >= 0) | |
448 | i2400m->updown = 1; | |
449 | mutex_unlock(&i2400m->init_mutex); | |
450 | return result; | |
451 | } | |
452 | ||
453 | ||
454 | /** | |
455 | * i2400m_dev_stop - Tear down driver communication with the device | |
456 | * | |
457 | * @i2400m: device descriptor | |
458 | * | |
459 | * Returns: 0 if ok, < 0 errno code on error. | |
460 | * | |
461 | * Releases all the resources allocated to communicate with the device. | |
462 | */ | |
463 | static | |
464 | void __i2400m_dev_stop(struct i2400m *i2400m) | |
465 | { | |
466 | struct wimax_dev *wimax_dev = &i2400m->wimax_dev; | |
467 | struct device *dev = i2400m_dev(i2400m); | |
468 | ||
469 | d_fnstart(3, dev, "(i2400m %p)\n", i2400m); | |
470 | wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING); | |
471 | i2400m_dev_shutdown(i2400m); | |
472 | i2400m->ready = 0; | |
473 | destroy_workqueue(i2400m->work_queue); | |
474 | i2400m->bus_dev_stop(i2400m); | |
475 | i2400m_tx_release(i2400m); | |
476 | wimax_state_change(wimax_dev, WIMAX_ST_DOWN); | |
477 | d_fnend(3, dev, "(i2400m %p) = 0\n", i2400m); | |
478 | } | |
479 | ||
480 | ||
481 | /* | |
482 | * Watch out -- we only need to stop if there is a need for it. The | |
483 | * device could have reset itself and failed to come up again (see | |
484 | * _i2400m_dev_reset_handle()). | |
485 | */ | |
486 | static | |
487 | void i2400m_dev_stop(struct i2400m *i2400m) | |
488 | { | |
489 | mutex_lock(&i2400m->init_mutex); | |
490 | if (i2400m->updown) { | |
491 | __i2400m_dev_stop(i2400m); | |
492 | i2400m->updown = 0; | |
493 | } | |
494 | mutex_unlock(&i2400m->init_mutex); | |
495 | } | |
496 | ||
497 | ||
498 | /* | |
499 | * The device has rebooted; fix up the device and the driver | |
500 | * | |
501 | * Tear down the driver communication with the device, reload the | |
502 | * firmware and reinitialize the communication with the device. | |
503 | * | |
504 | * If someone calls a reset when the device's firmware is down, in | |
505 | * theory we won't see it because we are not listening. However, just | |
506 | * in case, leave the code to handle it. | |
507 | * | |
508 | * If there is a reset context, use it; this means someone is waiting | |
509 | * for us to tell him when the reset operation is complete and the | |
510 | * device is ready to rock again. | |
511 | * | |
512 | * NOTE: if we are in the process of bringing up or down the | |
513 | * communication with the device [running i2400m_dev_start() or | |
514 | * _stop()], don't do anything, let it fail and handle it. | |
515 | * | |
516 | * This function is ran always in a thread context | |
517 | */ | |
518 | static | |
519 | void __i2400m_dev_reset_handle(struct work_struct *ws) | |
520 | { | |
521 | int result; | |
522 | struct i2400m_work *iw = container_of(ws, struct i2400m_work, ws); | |
523 | struct i2400m *i2400m = iw->i2400m; | |
524 | struct device *dev = i2400m_dev(i2400m); | |
525 | enum wimax_st wimax_state; | |
526 | struct i2400m_reset_ctx *ctx = i2400m->reset_ctx; | |
527 | ||
528 | d_fnstart(3, dev, "(ws %p i2400m %p)\n", ws, i2400m); | |
529 | result = 0; | |
530 | if (mutex_trylock(&i2400m->init_mutex) == 0) { | |
531 | /* We are still in i2400m_dev_start() [let it fail] or | |
532 | * i2400m_dev_stop() [we are shutting down anyway, so | |
533 | * ignore it] or we are resetting somewhere else. */ | |
534 | dev_err(dev, "device rebooted\n"); | |
535 | i2400m_msg_to_dev_cancel_wait(i2400m, -ERESTARTSYS); | |
536 | complete(&i2400m->msg_completion); | |
537 | goto out; | |
538 | } | |
539 | wimax_state = wimax_state_get(&i2400m->wimax_dev); | |
540 | if (wimax_state < WIMAX_ST_UNINITIALIZED) { | |
541 | dev_info(dev, "device rebooted: it is down, ignoring\n"); | |
542 | goto out_unlock; /* ifconfig up/down wasn't called */ | |
543 | } | |
544 | dev_err(dev, "device rebooted: reinitializing driver\n"); | |
545 | __i2400m_dev_stop(i2400m); | |
546 | i2400m->updown = 0; | |
547 | result = __i2400m_dev_start(i2400m, | |
548 | I2400M_BRI_SOFT | I2400M_BRI_MAC_REINIT); | |
549 | if (result < 0) { | |
550 | dev_err(dev, "device reboot: cannot start the device: %d\n", | |
551 | result); | |
552 | result = i2400m->bus_reset(i2400m, I2400M_RT_BUS); | |
553 | if (result >= 0) | |
554 | result = -ENODEV; | |
555 | } else | |
556 | i2400m->updown = 1; | |
557 | out_unlock: | |
558 | if (i2400m->reset_ctx) { | |
559 | ctx->result = result; | |
560 | complete(&ctx->completion); | |
561 | } | |
562 | mutex_unlock(&i2400m->init_mutex); | |
563 | out: | |
564 | i2400m_put(i2400m); | |
565 | kfree(iw); | |
566 | d_fnend(3, dev, "(ws %p i2400m %p) = void\n", ws, i2400m); | |
567 | return; | |
568 | } | |
569 | ||
570 | ||
571 | /** | |
572 | * i2400m_dev_reset_handle - Handle a device's reset in a thread context | |
573 | * | |
574 | * Schedule a device reset handling out on a thread context, so it | |
575 | * is safe to call from atomic context. We can't use the i2400m's | |
576 | * queue as we are going to destroy it and reinitialize it as part of | |
577 | * the driver bringup/bringup process. | |
578 | * | |
579 | * See __i2400m_dev_reset_handle() for details; that takes care of | |
580 | * reinitializing the driver to handle the reset, calling into the | |
581 | * bus-specific functions ops as needed. | |
582 | */ | |
583 | int i2400m_dev_reset_handle(struct i2400m *i2400m) | |
584 | { | |
585 | return i2400m_schedule_work(i2400m, __i2400m_dev_reset_handle, | |
586 | GFP_ATOMIC); | |
587 | } | |
588 | EXPORT_SYMBOL_GPL(i2400m_dev_reset_handle); | |
589 | ||
590 | ||
591 | /** | |
592 | * i2400m_setup - bus-generic setup function for the i2400m device | |
593 | * | |
594 | * @i2400m: device descriptor (bus-specific parts have been initialized) | |
595 | * | |
596 | * Returns: 0 if ok, < 0 errno code on error. | |
597 | * | |
598 | * Initializes the bus-generic parts of the i2400m driver; the | |
599 | * bus-specific parts have been initialized, function pointers filled | |
600 | * out by the bus-specific probe function. | |
601 | * | |
602 | * As well, this registers the WiMAX and net device nodes. Once this | |
603 | * function returns, the device is operative and has to be ready to | |
604 | * receive and send network traffic and WiMAX control operations. | |
605 | */ | |
606 | int i2400m_setup(struct i2400m *i2400m, enum i2400m_bri bm_flags) | |
607 | { | |
608 | int result = -ENODEV; | |
609 | struct device *dev = i2400m_dev(i2400m); | |
610 | struct wimax_dev *wimax_dev = &i2400m->wimax_dev; | |
611 | struct net_device *net_dev = i2400m->wimax_dev.net_dev; | |
612 | ||
613 | d_fnstart(3, dev, "(i2400m %p)\n", i2400m); | |
614 | ||
615 | snprintf(wimax_dev->name, sizeof(wimax_dev->name), | |
616 | "i2400m-%s:%s", dev->bus->name, dev->bus_id); | |
617 | ||
618 | i2400m->bm_cmd_buf = kzalloc(I2400M_BM_CMD_BUF_SIZE, GFP_KERNEL); | |
619 | if (i2400m->bm_cmd_buf == NULL) { | |
620 | dev_err(dev, "cannot allocate USB command buffer\n"); | |
621 | goto error_bm_cmd_kzalloc; | |
622 | } | |
623 | i2400m->bm_ack_buf = kzalloc(I2400M_BM_ACK_BUF_SIZE, GFP_KERNEL); | |
624 | if (i2400m->bm_ack_buf == NULL) { | |
625 | dev_err(dev, "cannot allocate USB ack buffer\n"); | |
626 | goto error_bm_ack_buf_kzalloc; | |
627 | } | |
628 | result = i2400m_bootrom_init(i2400m, bm_flags); | |
629 | if (result < 0) { | |
630 | dev_err(dev, "read mac addr: bootrom init " | |
631 | "failed: %d\n", result); | |
632 | goto error_bootrom_init; | |
633 | } | |
634 | result = i2400m_read_mac_addr(i2400m); | |
635 | if (result < 0) | |
636 | goto error_read_mac_addr; | |
637 | ||
638 | result = register_netdev(net_dev); /* Okey dokey, bring it up */ | |
639 | if (result < 0) { | |
640 | dev_err(dev, "cannot register i2400m network device: %d\n", | |
641 | result); | |
642 | goto error_register_netdev; | |
643 | } | |
644 | netif_carrier_off(net_dev); | |
645 | ||
646 | result = i2400m_dev_start(i2400m, bm_flags); | |
647 | if (result < 0) | |
648 | goto error_dev_start; | |
649 | ||
650 | i2400m->wimax_dev.op_msg_from_user = i2400m_op_msg_from_user; | |
651 | i2400m->wimax_dev.op_rfkill_sw_toggle = i2400m_op_rfkill_sw_toggle; | |
652 | i2400m->wimax_dev.op_reset = i2400m_op_reset; | |
653 | result = wimax_dev_add(&i2400m->wimax_dev, net_dev); | |
654 | if (result < 0) | |
655 | goto error_wimax_dev_add; | |
656 | /* User space needs to do some init stuff */ | |
657 | wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED); | |
658 | ||
659 | /* Now setup all that requires a registered net and wimax device. */ | |
660 | result = i2400m_debugfs_add(i2400m); | |
661 | if (result < 0) { | |
662 | dev_err(dev, "cannot setup i2400m's debugfs: %d\n", result); | |
663 | goto error_debugfs_setup; | |
664 | } | |
665 | d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result); | |
666 | return result; | |
667 | ||
668 | error_debugfs_setup: | |
669 | wimax_dev_rm(&i2400m->wimax_dev); | |
670 | error_wimax_dev_add: | |
671 | i2400m_dev_stop(i2400m); | |
672 | error_dev_start: | |
673 | unregister_netdev(net_dev); | |
674 | error_register_netdev: | |
675 | error_read_mac_addr: | |
676 | error_bootrom_init: | |
677 | kfree(i2400m->bm_ack_buf); | |
678 | error_bm_ack_buf_kzalloc: | |
679 | kfree(i2400m->bm_cmd_buf); | |
680 | error_bm_cmd_kzalloc: | |
681 | d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result); | |
682 | return result; | |
683 | } | |
684 | EXPORT_SYMBOL_GPL(i2400m_setup); | |
685 | ||
686 | ||
687 | /** | |
688 | * i2400m_release - release the bus-generic driver resources | |
689 | * | |
690 | * Sends a disconnect message and undoes any setup done by i2400m_setup() | |
691 | */ | |
692 | void i2400m_release(struct i2400m *i2400m) | |
693 | { | |
694 | struct device *dev = i2400m_dev(i2400m); | |
695 | ||
696 | d_fnstart(3, dev, "(i2400m %p)\n", i2400m); | |
697 | netif_stop_queue(i2400m->wimax_dev.net_dev); | |
698 | ||
699 | i2400m_debugfs_rm(i2400m); | |
700 | wimax_dev_rm(&i2400m->wimax_dev); | |
701 | i2400m_dev_stop(i2400m); | |
702 | unregister_netdev(i2400m->wimax_dev.net_dev); | |
703 | kfree(i2400m->bm_ack_buf); | |
704 | kfree(i2400m->bm_cmd_buf); | |
705 | d_fnend(3, dev, "(i2400m %p) = void\n", i2400m); | |
706 | } | |
707 | EXPORT_SYMBOL_GPL(i2400m_release); | |
708 | ||
709 | ||
1af7ad51 IPG |
710 | /* |
711 | * Debug levels control; see debug.h | |
712 | */ | |
713 | struct d_level D_LEVEL[] = { | |
714 | D_SUBMODULE_DEFINE(control), | |
715 | D_SUBMODULE_DEFINE(driver), | |
716 | D_SUBMODULE_DEFINE(debugfs), | |
717 | D_SUBMODULE_DEFINE(fw), | |
718 | D_SUBMODULE_DEFINE(netdev), | |
719 | D_SUBMODULE_DEFINE(rfkill), | |
720 | D_SUBMODULE_DEFINE(rx), | |
721 | D_SUBMODULE_DEFINE(tx), | |
722 | }; | |
723 | size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL); | |
724 | ||
725 | ||
024f7f31 IPG |
726 | static |
727 | int __init i2400m_driver_init(void) | |
728 | { | |
729 | return 0; | |
730 | } | |
731 | module_init(i2400m_driver_init); | |
732 | ||
733 | static | |
734 | void __exit i2400m_driver_exit(void) | |
735 | { | |
736 | /* for scheds i2400m_dev_reset_handle() */ | |
737 | flush_scheduled_work(); | |
738 | return; | |
739 | } | |
740 | module_exit(i2400m_driver_exit); | |
741 | ||
742 | MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>"); | |
743 | MODULE_DESCRIPTION("Intel 2400M WiMAX networking bus-generic driver"); | |
744 | MODULE_LICENSE("GPL"); |