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31#include <linux/kernel.h>
32#include <linux/err.h>
33#include <linux/delay.h>
34
35#include "uwb-internal.h"
36
37
38
39
40static
41const char *__strerror[] = {
42 "success",
43 "failure",
44 "hardware failure",
45 "no more slots",
46 "beacon is too large",
47 "invalid parameter",
48 "unsupported power level",
49 "time out (wa) or invalid ie data (whci)",
50 "beacon size exceeded",
51 "cancelled",
52 "invalid state",
53 "invalid size",
54 "ack not recieved",
55 "no more asie notification",
56};
57
58
59
60const char *uwb_rc_strerror(unsigned code)
61{
62 if (code == 255)
63 return "time out";
64 if (code >= ARRAY_SIZE(__strerror))
65 return "unknown error";
66 return __strerror[code];
67}
68
69int uwb_rc_cmd_async(struct uwb_rc *rc, const char *cmd_name,
70 struct uwb_rccb *cmd, size_t cmd_size,
71 u8 expected_type, u16 expected_event,
72 uwb_rc_cmd_cb_f cb, void *arg)
73{
74 struct device *dev = &rc->uwb_dev.dev;
75 struct uwb_rc_neh *neh;
76 int needtofree = 0;
77 int result;
78
79 uwb_dev_lock(&rc->uwb_dev);
80 if (rc->priv == NULL) {
81 uwb_dev_unlock(&rc->uwb_dev);
82 return -ESHUTDOWN;
83 }
84
85 if (rc->filter_cmd) {
86 needtofree = rc->filter_cmd(rc, &cmd, &cmd_size);
87 if (needtofree < 0 && needtofree != -ENOANO) {
88 dev_err(dev, "%s: filter error: %d\n",
89 cmd_name, needtofree);
90 uwb_dev_unlock(&rc->uwb_dev);
91 return needtofree;
92 }
93 }
94
95 neh = uwb_rc_neh_add(rc, cmd, expected_type, expected_event, cb, arg);
96 if (IS_ERR(neh)) {
97 result = PTR_ERR(neh);
98 goto out;
99 }
100
101 result = rc->cmd(rc, cmd, cmd_size);
102 uwb_dev_unlock(&rc->uwb_dev);
103 if (result < 0)
104 uwb_rc_neh_rm(rc, neh);
105 else
106 uwb_rc_neh_arm(rc, neh);
107 uwb_rc_neh_put(neh);
108out:
109 if (needtofree == 1)
110 kfree(cmd);
111 return result < 0 ? result : 0;
112}
113EXPORT_SYMBOL_GPL(uwb_rc_cmd_async);
114
115struct uwb_rc_cmd_done_params {
116 struct completion completion;
117 struct uwb_rceb *reply;
118 ssize_t reply_size;
119};
120
121static void uwb_rc_cmd_done(struct uwb_rc *rc, void *arg,
122 struct uwb_rceb *reply, ssize_t reply_size)
123{
124 struct uwb_rc_cmd_done_params *p = (struct uwb_rc_cmd_done_params *)arg;
125
126 if (reply_size > 0) {
127 if (p->reply)
128 reply_size = min(p->reply_size, reply_size);
129 else
130 p->reply = kmalloc(reply_size, GFP_ATOMIC);
131
132 if (p->reply)
133 memcpy(p->reply, reply, reply_size);
134 else
135 reply_size = -ENOMEM;
136 }
137 p->reply_size = reply_size;
138 complete(&p->completion);
139}
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167static
168ssize_t __uwb_rc_cmd(struct uwb_rc *rc, const char *cmd_name,
169 struct uwb_rccb *cmd, size_t cmd_size,
170 struct uwb_rceb *reply, size_t reply_size,
171 u8 expected_type, u16 expected_event,
172 struct uwb_rceb **preply)
173{
174 ssize_t result = 0;
175 struct device *dev = &rc->uwb_dev.dev;
176 struct uwb_rc_cmd_done_params params;
177
178 init_completion(¶ms.completion);
179 params.reply = reply;
180 params.reply_size = reply_size;
181
182 result = uwb_rc_cmd_async(rc, cmd_name, cmd, cmd_size,
183 expected_type, expected_event,
184 uwb_rc_cmd_done, ¶ms);
185 if (result)
186 return result;
187
188 wait_for_completion(¶ms.completion);
189
190 if (preply)
191 *preply = params.reply;
192
193 if (params.reply_size < 0)
194 dev_err(dev, "%s: confirmation event 0x%02x/%04x/%02x "
195 "reception failed: %d\n", cmd_name,
196 expected_type, expected_event, cmd->bCommandContext,
197 (int)params.reply_size);
198 return params.reply_size;
199}
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224ssize_t uwb_rc_cmd(struct uwb_rc *rc, const char *cmd_name,
225 struct uwb_rccb *cmd, size_t cmd_size,
226 struct uwb_rceb *reply, size_t reply_size)
227{
228 struct device *dev = &rc->uwb_dev.dev;
229 ssize_t result;
230
231 result = __uwb_rc_cmd(rc, cmd_name,
232 cmd, cmd_size, reply, reply_size,
233 reply->bEventType, reply->wEvent, NULL);
234
235 if (result > 0 && result < reply_size) {
236 dev_err(dev, "%s: not enough data returned for decoding reply "
237 "(%zu bytes received vs at least %zu needed)\n",
238 cmd_name, result, reply_size);
239 result = -EIO;
240 }
241 return result;
242}
243EXPORT_SYMBOL_GPL(uwb_rc_cmd);
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267ssize_t uwb_rc_vcmd(struct uwb_rc *rc, const char *cmd_name,
268 struct uwb_rccb *cmd, size_t cmd_size,
269 u8 expected_type, u16 expected_event,
270 struct uwb_rceb **preply)
271{
272 return __uwb_rc_cmd(rc, cmd_name, cmd, cmd_size, NULL, 0,
273 expected_type, expected_event, preply);
274}
275EXPORT_SYMBOL_GPL(uwb_rc_vcmd);
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288int uwb_rc_reset(struct uwb_rc *rc)
289{
290 int result = -ENOMEM;
291 struct uwb_rc_evt_confirm reply;
292 struct uwb_rccb *cmd;
293 size_t cmd_size = sizeof(*cmd);
294
295 mutex_lock(&rc->uwb_dev.mutex);
296 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
297 if (cmd == NULL)
298 goto error_kzalloc;
299 cmd->bCommandType = UWB_RC_CET_GENERAL;
300 cmd->wCommand = cpu_to_le16(UWB_RC_CMD_RESET);
301 reply.rceb.bEventType = UWB_RC_CET_GENERAL;
302 reply.rceb.wEvent = UWB_RC_CMD_RESET;
303 result = uwb_rc_cmd(rc, "RESET", cmd, cmd_size,
304 &reply.rceb, sizeof(reply));
305 if (result < 0)
306 goto error_cmd;
307 if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
308 dev_err(&rc->uwb_dev.dev,
309 "RESET: command execution failed: %s (%d)\n",
310 uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
311 result = -EIO;
312 }
313error_cmd:
314 kfree(cmd);
315error_kzalloc:
316 mutex_unlock(&rc->uwb_dev.mutex);
317 return result;
318}
319
320int uwbd_msg_handle_reset(struct uwb_event *evt)
321{
322 struct uwb_rc *rc = evt->rc;
323 int ret;
324
325 dev_info(&rc->uwb_dev.dev, "resetting radio controller\n");
326 ret = rc->reset(rc);
327 if (ret < 0) {
328 dev_err(&rc->uwb_dev.dev, "failed to reset hardware: %d\n", ret);
329 goto error;
330 }
331 return 0;
332error:
333
334
335 msleep(1000);
336 uwb_rc_reset_all(rc);
337 return ret;
338}
339
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346
347void uwb_rc_reset_all(struct uwb_rc *rc)
348{
349 struct uwb_event *evt;
350
351 evt = kzalloc(sizeof(struct uwb_event), GFP_ATOMIC);
352 if (unlikely(evt == NULL))
353 return;
354
355 evt->rc = __uwb_rc_get(rc);
356 evt->ts_jiffies = jiffies;
357 evt->type = UWB_EVT_TYPE_MSG;
358 evt->message = UWB_EVT_MSG_RESET;
359
360 uwbd_event_queue(evt);
361}
362EXPORT_SYMBOL_GPL(uwb_rc_reset_all);
363
364void uwb_rc_pre_reset(struct uwb_rc *rc)
365{
366 rc->stop(rc);
367 uwbd_flush(rc);
368
369 uwb_radio_reset_state(rc);
370 uwb_rsv_remove_all(rc);
371}
372EXPORT_SYMBOL_GPL(uwb_rc_pre_reset);
373
374int uwb_rc_post_reset(struct uwb_rc *rc)
375{
376 int ret;
377
378 ret = rc->start(rc);
379 if (ret)
380 goto out;
381 ret = uwb_rc_mac_addr_set(rc, &rc->uwb_dev.mac_addr);
382 if (ret)
383 goto out;
384 ret = uwb_rc_dev_addr_set(rc, &rc->uwb_dev.dev_addr);
385 if (ret)
386 goto out;
387out:
388 return ret;
389}
390EXPORT_SYMBOL_GPL(uwb_rc_post_reset);
391