Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * UHCI-specific debugging code. Invaluable when something | |
3 | * goes wrong, but don't get in my face. | |
4 | * | |
5 | * Kernel visible pointers are surrounded in []'s and bus | |
6 | * visible pointers are surrounded in ()'s | |
7 | * | |
8 | * (C) Copyright 1999 Linus Torvalds | |
9 | * (C) Copyright 1999-2001 Johannes Erdfelt | |
10 | */ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/debugfs.h> | |
15 | #include <linux/smp_lock.h> | |
16 | #include <asm/io.h> | |
17 | ||
18 | #include "uhci-hcd.h" | |
19 | ||
20 | static struct dentry *uhci_debugfs_root = NULL; | |
21 | ||
22 | /* Handle REALLY large printk's so we don't overflow buffers */ | |
23 | static inline void lprintk(char *buf) | |
24 | { | |
25 | char *p; | |
26 | ||
27 | /* Just write one line at a time */ | |
28 | while (buf) { | |
29 | p = strchr(buf, '\n'); | |
30 | if (p) | |
31 | *p = 0; | |
32 | printk(KERN_DEBUG "%s\n", buf); | |
33 | buf = p; | |
34 | if (buf) | |
35 | buf++; | |
36 | } | |
37 | } | |
38 | ||
39 | static int uhci_show_td(struct uhci_td *td, char *buf, int len, int space) | |
40 | { | |
41 | char *out = buf; | |
42 | char *spid; | |
43 | u32 status, token; | |
44 | ||
45 | /* Try to make sure there's enough memory */ | |
46 | if (len < 160) | |
47 | return 0; | |
48 | ||
49 | status = td_status(td); | |
50 | out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td, le32_to_cpu(td->link)); | |
51 | out += sprintf(out, "e%d %s%s%s%s%s%s%s%s%s%sLength=%x ", | |
52 | ((status >> 27) & 3), | |
53 | (status & TD_CTRL_SPD) ? "SPD " : "", | |
54 | (status & TD_CTRL_LS) ? "LS " : "", | |
55 | (status & TD_CTRL_IOC) ? "IOC " : "", | |
56 | (status & TD_CTRL_ACTIVE) ? "Active " : "", | |
57 | (status & TD_CTRL_STALLED) ? "Stalled " : "", | |
58 | (status & TD_CTRL_DBUFERR) ? "DataBufErr " : "", | |
59 | (status & TD_CTRL_BABBLE) ? "Babble " : "", | |
60 | (status & TD_CTRL_NAK) ? "NAK " : "", | |
61 | (status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "", | |
62 | (status & TD_CTRL_BITSTUFF) ? "BitStuff " : "", | |
63 | status & 0x7ff); | |
64 | ||
65 | token = td_token(td); | |
66 | switch (uhci_packetid(token)) { | |
67 | case USB_PID_SETUP: | |
68 | spid = "SETUP"; | |
69 | break; | |
70 | case USB_PID_OUT: | |
71 | spid = "OUT"; | |
72 | break; | |
73 | case USB_PID_IN: | |
74 | spid = "IN"; | |
75 | break; | |
76 | default: | |
77 | spid = "?"; | |
78 | break; | |
79 | } | |
80 | ||
81 | out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ", | |
82 | token >> 21, | |
83 | ((token >> 19) & 1), | |
84 | (token >> 15) & 15, | |
85 | (token >> 8) & 127, | |
86 | (token & 0xff), | |
87 | spid); | |
88 | out += sprintf(out, "(buf=%08x)\n", le32_to_cpu(td->buffer)); | |
89 | ||
90 | return out - buf; | |
91 | } | |
92 | ||
93 | static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space) | |
94 | { | |
95 | char *out = buf; | |
96 | struct urb_priv *urbp; | |
97 | struct list_head *head, *tmp; | |
98 | struct uhci_td *td; | |
99 | int i = 0, checked = 0, prevactive = 0; | |
100 | __le32 element = qh_element(qh); | |
101 | ||
102 | /* Try to make sure there's enough memory */ | |
103 | if (len < 80 * 6) | |
104 | return 0; | |
105 | ||
106 | out += sprintf(out, "%*s[%p] link (%08x) element (%08x)\n", space, "", | |
107 | qh, le32_to_cpu(qh->link), le32_to_cpu(element)); | |
108 | ||
109 | if (element & UHCI_PTR_QH) | |
110 | out += sprintf(out, "%*s Element points to QH (bug?)\n", space, ""); | |
111 | ||
112 | if (element & UHCI_PTR_DEPTH) | |
113 | out += sprintf(out, "%*s Depth traverse\n", space, ""); | |
114 | ||
115 | if (element & cpu_to_le32(8)) | |
116 | out += sprintf(out, "%*s Bit 3 set (bug?)\n", space, ""); | |
117 | ||
118 | if (!(element & ~(UHCI_PTR_QH | UHCI_PTR_DEPTH))) | |
119 | out += sprintf(out, "%*s Element is NULL (bug?)\n", space, ""); | |
120 | ||
121 | if (!qh->urbp) { | |
122 | out += sprintf(out, "%*s urbp == NULL\n", space, ""); | |
123 | goto out; | |
124 | } | |
125 | ||
126 | urbp = qh->urbp; | |
127 | ||
128 | head = &urbp->td_list; | |
129 | tmp = head->next; | |
130 | ||
131 | td = list_entry(tmp, struct uhci_td, list); | |
132 | ||
133 | if (cpu_to_le32(td->dma_handle) != (element & ~UHCI_PTR_BITS)) | |
134 | out += sprintf(out, "%*s Element != First TD\n", space, ""); | |
135 | ||
136 | while (tmp != head) { | |
137 | struct uhci_td *td = list_entry(tmp, struct uhci_td, list); | |
138 | ||
139 | tmp = tmp->next; | |
140 | ||
141 | out += sprintf(out, "%*s%d: ", space + 2, "", i++); | |
142 | out += uhci_show_td(td, out, len - (out - buf), 0); | |
143 | ||
144 | if (i > 10 && !checked && prevactive && tmp != head && | |
145 | debug <= 2) { | |
146 | struct list_head *ntmp = tmp; | |
147 | struct uhci_td *ntd = td; | |
148 | int active = 1, ni = i; | |
149 | ||
150 | checked = 1; | |
151 | ||
152 | while (ntmp != head && ntmp->next != head && active) { | |
153 | ntd = list_entry(ntmp, struct uhci_td, list); | |
154 | ||
155 | ntmp = ntmp->next; | |
156 | ||
157 | active = td_status(ntd) & TD_CTRL_ACTIVE; | |
158 | ||
159 | ni++; | |
160 | } | |
161 | ||
162 | if (active && ni > i) { | |
163 | out += sprintf(out, "%*s[skipped %d active TD's]\n", space, "", ni - i); | |
164 | tmp = ntmp; | |
165 | td = ntd; | |
166 | i = ni; | |
167 | } | |
168 | } | |
169 | ||
170 | prevactive = td_status(td) & TD_CTRL_ACTIVE; | |
171 | } | |
172 | ||
173 | if (list_empty(&urbp->queue_list) || urbp->queued) | |
174 | goto out; | |
175 | ||
176 | out += sprintf(out, "%*sQueued QH's:\n", -space, "--"); | |
177 | ||
178 | head = &urbp->queue_list; | |
179 | tmp = head->next; | |
180 | ||
181 | while (tmp != head) { | |
182 | struct urb_priv *nurbp = list_entry(tmp, struct urb_priv, | |
183 | queue_list); | |
184 | tmp = tmp->next; | |
185 | ||
186 | out += uhci_show_qh(nurbp->qh, out, len - (out - buf), space); | |
187 | } | |
188 | ||
189 | out: | |
190 | return out - buf; | |
191 | } | |
192 | ||
193 | #define show_frame_num() \ | |
194 | if (!shown) { \ | |
195 | shown = 1; \ | |
196 | out += sprintf(out, "- Frame %d\n", i); \ | |
197 | } | |
198 | ||
199 | #ifdef CONFIG_PROC_FS | |
200 | static const char *qh_names[] = { | |
201 | "skel_int128_qh", "skel_int64_qh", | |
202 | "skel_int32_qh", "skel_int16_qh", | |
203 | "skel_int8_qh", "skel_int4_qh", | |
204 | "skel_int2_qh", "skel_int1_qh", | |
205 | "skel_ls_control_qh", "skel_fs_control_qh", | |
206 | "skel_bulk_qh", "skel_term_qh" | |
207 | }; | |
208 | ||
209 | #define show_qh_name() \ | |
210 | if (!shown) { \ | |
211 | shown = 1; \ | |
212 | out += sprintf(out, "- %s\n", qh_names[i]); \ | |
213 | } | |
214 | ||
215 | static int uhci_show_sc(int port, unsigned short status, char *buf, int len) | |
216 | { | |
217 | char *out = buf; | |
218 | ||
219 | /* Try to make sure there's enough memory */ | |
220 | if (len < 160) | |
221 | return 0; | |
222 | ||
223 | out += sprintf(out, " stat%d = %04x %s%s%s%s%s%s%s%s%s%s\n", | |
224 | port, | |
225 | status, | |
226 | (status & USBPORTSC_SUSP) ? " Suspend" : "", | |
227 | (status & USBPORTSC_OCC) ? " OverCurrentChange" : "", | |
228 | (status & USBPORTSC_OC) ? " OverCurrent" : "", | |
229 | (status & USBPORTSC_PR) ? " Reset" : "", | |
230 | (status & USBPORTSC_LSDA) ? " LowSpeed" : "", | |
231 | (status & USBPORTSC_RD) ? " ResumeDetect" : "", | |
232 | (status & USBPORTSC_PEC) ? " EnableChange" : "", | |
233 | (status & USBPORTSC_PE) ? " Enabled" : "", | |
234 | (status & USBPORTSC_CSC) ? " ConnectChange" : "", | |
235 | (status & USBPORTSC_CCS) ? " Connected" : ""); | |
236 | ||
237 | return out - buf; | |
238 | } | |
239 | ||
c8f4fe43 AS |
240 | static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf, int len) |
241 | { | |
242 | char *out = buf; | |
243 | char *rh_state; | |
244 | ||
245 | /* Try to make sure there's enough memory */ | |
246 | if (len < 60) | |
247 | return 0; | |
248 | ||
249 | switch (uhci->rh_state) { | |
250 | case UHCI_RH_RESET: | |
251 | rh_state = "reset"; break; | |
252 | case UHCI_RH_SUSPENDED: | |
253 | rh_state = "suspended"; break; | |
254 | case UHCI_RH_AUTO_STOPPED: | |
255 | rh_state = "auto-stopped"; break; | |
256 | case UHCI_RH_RESUMING: | |
257 | rh_state = "resuming"; break; | |
258 | case UHCI_RH_SUSPENDING: | |
259 | rh_state = "suspending"; break; | |
260 | case UHCI_RH_RUNNING: | |
261 | rh_state = "running"; break; | |
262 | case UHCI_RH_RUNNING_NODEVS: | |
263 | rh_state = "running, no devs"; break; | |
264 | default: | |
265 | rh_state = "?"; break; | |
266 | } | |
267 | out += sprintf(out, "Root-hub state: %s\n", rh_state); | |
268 | return out - buf; | |
269 | } | |
270 | ||
1da177e4 LT |
271 | static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len) |
272 | { | |
273 | char *out = buf; | |
274 | unsigned long io_addr = uhci->io_addr; | |
275 | unsigned short usbcmd, usbstat, usbint, usbfrnum; | |
276 | unsigned int flbaseadd; | |
277 | unsigned char sof; | |
278 | unsigned short portsc1, portsc2; | |
279 | ||
280 | /* Try to make sure there's enough memory */ | |
281 | if (len < 80 * 6) | |
282 | return 0; | |
283 | ||
284 | usbcmd = inw(io_addr + 0); | |
285 | usbstat = inw(io_addr + 2); | |
286 | usbint = inw(io_addr + 4); | |
287 | usbfrnum = inw(io_addr + 6); | |
288 | flbaseadd = inl(io_addr + 8); | |
289 | sof = inb(io_addr + 12); | |
290 | portsc1 = inw(io_addr + 16); | |
291 | portsc2 = inw(io_addr + 18); | |
292 | ||
293 | out += sprintf(out, " usbcmd = %04x %s%s%s%s%s%s%s%s\n", | |
294 | usbcmd, | |
295 | (usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ", | |
296 | (usbcmd & USBCMD_CF) ? "CF " : "", | |
297 | (usbcmd & USBCMD_SWDBG) ? "SWDBG " : "", | |
298 | (usbcmd & USBCMD_FGR) ? "FGR " : "", | |
299 | (usbcmd & USBCMD_EGSM) ? "EGSM " : "", | |
300 | (usbcmd & USBCMD_GRESET) ? "GRESET " : "", | |
301 | (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "", | |
302 | (usbcmd & USBCMD_RS) ? "RS " : ""); | |
303 | ||
304 | out += sprintf(out, " usbstat = %04x %s%s%s%s%s%s\n", | |
305 | usbstat, | |
306 | (usbstat & USBSTS_HCH) ? "HCHalted " : "", | |
307 | (usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "", | |
308 | (usbstat & USBSTS_HSE) ? "HostSystemError " : "", | |
309 | (usbstat & USBSTS_RD) ? "ResumeDetect " : "", | |
310 | (usbstat & USBSTS_ERROR) ? "USBError " : "", | |
311 | (usbstat & USBSTS_USBINT) ? "USBINT " : ""); | |
312 | ||
313 | out += sprintf(out, " usbint = %04x\n", usbint); | |
314 | out += sprintf(out, " usbfrnum = (%d)%03x\n", (usbfrnum >> 10) & 1, | |
315 | 0xfff & (4*(unsigned int)usbfrnum)); | |
316 | out += sprintf(out, " flbaseadd = %08x\n", flbaseadd); | |
317 | out += sprintf(out, " sof = %02x\n", sof); | |
318 | out += uhci_show_sc(1, portsc1, out, len - (out - buf)); | |
319 | out += uhci_show_sc(2, portsc2, out, len - (out - buf)); | |
320 | ||
321 | return out - buf; | |
322 | } | |
323 | ||
324 | static int uhci_show_urbp(struct uhci_hcd *uhci, struct urb_priv *urbp, char *buf, int len) | |
325 | { | |
326 | struct list_head *tmp; | |
327 | char *out = buf; | |
328 | int count = 0; | |
329 | ||
330 | if (len < 200) | |
331 | return 0; | |
332 | ||
333 | out += sprintf(out, "urb_priv [%p] ", urbp); | |
334 | out += sprintf(out, "urb [%p] ", urbp->urb); | |
335 | out += sprintf(out, "qh [%p] ", urbp->qh); | |
336 | out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe)); | |
337 | out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe), (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT")); | |
338 | ||
339 | switch (usb_pipetype(urbp->urb->pipe)) { | |
340 | case PIPE_ISOCHRONOUS: out += sprintf(out, "ISO "); break; | |
341 | case PIPE_INTERRUPT: out += sprintf(out, "INT "); break; | |
342 | case PIPE_BULK: out += sprintf(out, "BLK "); break; | |
343 | case PIPE_CONTROL: out += sprintf(out, "CTL "); break; | |
344 | } | |
345 | ||
346 | out += sprintf(out, "%s", (urbp->fsbr ? "FSBR " : "")); | |
347 | out += sprintf(out, "%s", (urbp->fsbr_timeout ? "FSBR_TO " : "")); | |
348 | ||
349 | if (urbp->urb->status != -EINPROGRESS) | |
350 | out += sprintf(out, "Status=%d ", urbp->urb->status); | |
1da177e4 LT |
351 | //out += sprintf(out, "FSBRtime=%lx ",urbp->fsbrtime); |
352 | ||
353 | count = 0; | |
354 | list_for_each(tmp, &urbp->td_list) | |
355 | count++; | |
356 | out += sprintf(out, "TDs=%d ",count); | |
357 | ||
358 | if (urbp->queued) | |
359 | out += sprintf(out, "queued\n"); | |
360 | else { | |
361 | count = 0; | |
362 | list_for_each(tmp, &urbp->queue_list) | |
363 | count++; | |
364 | out += sprintf(out, "queued URBs=%d\n", count); | |
365 | } | |
366 | ||
367 | return out - buf; | |
368 | } | |
369 | ||
370 | static int uhci_show_lists(struct uhci_hcd *uhci, char *buf, int len) | |
371 | { | |
372 | char *out = buf; | |
373 | struct list_head *head, *tmp; | |
374 | int count; | |
375 | ||
376 | out += sprintf(out, "Main list URBs:"); | |
377 | if (list_empty(&uhci->urb_list)) | |
378 | out += sprintf(out, " Empty\n"); | |
379 | else { | |
380 | out += sprintf(out, "\n"); | |
381 | count = 0; | |
382 | head = &uhci->urb_list; | |
383 | tmp = head->next; | |
384 | while (tmp != head) { | |
385 | struct urb_priv *urbp = list_entry(tmp, struct urb_priv, urb_list); | |
386 | ||
387 | out += sprintf(out, " %d: ", ++count); | |
388 | out += uhci_show_urbp(uhci, urbp, out, len - (out - buf)); | |
389 | tmp = tmp->next; | |
390 | } | |
391 | } | |
392 | ||
393 | out += sprintf(out, "Remove list URBs:"); | |
394 | if (list_empty(&uhci->urb_remove_list)) | |
395 | out += sprintf(out, " Empty\n"); | |
396 | else { | |
397 | out += sprintf(out, "\n"); | |
398 | count = 0; | |
399 | head = &uhci->urb_remove_list; | |
400 | tmp = head->next; | |
401 | while (tmp != head) { | |
402 | struct urb_priv *urbp = list_entry(tmp, struct urb_priv, urb_list); | |
403 | ||
404 | out += sprintf(out, " %d: ", ++count); | |
405 | out += uhci_show_urbp(uhci, urbp, out, len - (out - buf)); | |
406 | tmp = tmp->next; | |
407 | } | |
408 | } | |
409 | ||
410 | out += sprintf(out, "Complete list URBs:"); | |
411 | if (list_empty(&uhci->complete_list)) | |
412 | out += sprintf(out, " Empty\n"); | |
413 | else { | |
414 | out += sprintf(out, "\n"); | |
415 | count = 0; | |
416 | head = &uhci->complete_list; | |
417 | tmp = head->next; | |
418 | while (tmp != head) { | |
419 | struct urb_priv *urbp = list_entry(tmp, struct urb_priv, urb_list); | |
420 | ||
421 | out += sprintf(out, " %d: ", ++count); | |
422 | out += uhci_show_urbp(uhci, urbp, out, len - (out - buf)); | |
423 | tmp = tmp->next; | |
424 | } | |
425 | } | |
426 | ||
427 | return out - buf; | |
428 | } | |
429 | ||
430 | static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len) | |
431 | { | |
432 | unsigned long flags; | |
433 | char *out = buf; | |
434 | int i, j; | |
435 | struct uhci_qh *qh; | |
436 | struct uhci_td *td; | |
437 | struct list_head *tmp, *head; | |
438 | ||
439 | spin_lock_irqsave(&uhci->lock, flags); | |
440 | ||
c8f4fe43 | 441 | out += uhci_show_root_hub_state(uhci, out, len - (out - buf)); |
1da177e4 LT |
442 | out += sprintf(out, "HC status\n"); |
443 | out += uhci_show_status(uhci, out, len - (out - buf)); | |
444 | ||
445 | out += sprintf(out, "Frame List\n"); | |
446 | for (i = 0; i < UHCI_NUMFRAMES; ++i) { | |
447 | int shown = 0; | |
448 | td = uhci->fl->frame_cpu[i]; | |
449 | if (!td) | |
450 | continue; | |
451 | ||
452 | if (td->dma_handle != (dma_addr_t)uhci->fl->frame[i]) { | |
453 | show_frame_num(); | |
454 | out += sprintf(out, " frame list does not match td->dma_handle!\n"); | |
455 | } | |
456 | show_frame_num(); | |
457 | ||
458 | head = &td->fl_list; | |
459 | tmp = head; | |
460 | do { | |
461 | td = list_entry(tmp, struct uhci_td, fl_list); | |
462 | tmp = tmp->next; | |
463 | out += uhci_show_td(td, out, len - (out - buf), 4); | |
464 | } while (tmp != head); | |
465 | } | |
466 | ||
467 | out += sprintf(out, "Skeleton QH's\n"); | |
468 | ||
469 | for (i = 0; i < UHCI_NUM_SKELQH; ++i) { | |
470 | int shown = 0; | |
471 | ||
472 | qh = uhci->skelqh[i]; | |
473 | ||
474 | if (debug > 1) { | |
475 | show_qh_name(); | |
476 | out += uhci_show_qh(qh, out, len - (out - buf), 4); | |
477 | } | |
478 | ||
479 | /* Last QH is the Terminating QH, it's different */ | |
480 | if (i == UHCI_NUM_SKELQH - 1) { | |
481 | if (qh->link != UHCI_PTR_TERM) | |
482 | out += sprintf(out, " bandwidth reclamation on!\n"); | |
483 | ||
484 | if (qh_element(qh) != cpu_to_le32(uhci->term_td->dma_handle)) | |
485 | out += sprintf(out, " skel_term_qh element is not set to term_td!\n"); | |
486 | ||
487 | continue; | |
488 | } | |
489 | ||
490 | j = (i < 7) ? 7 : i+1; /* Next skeleton */ | |
491 | if (list_empty(&qh->list)) { | |
492 | if (i < UHCI_NUM_SKELQH - 1) { | |
493 | if (qh->link != | |
494 | (cpu_to_le32(uhci->skelqh[j]->dma_handle) | UHCI_PTR_QH)) { | |
495 | show_qh_name(); | |
496 | out += sprintf(out, " skeleton QH not linked to next skeleton QH!\n"); | |
497 | } | |
498 | } | |
499 | ||
500 | continue; | |
501 | } | |
502 | ||
503 | show_qh_name(); | |
504 | ||
505 | head = &qh->list; | |
506 | tmp = head->next; | |
507 | ||
508 | while (tmp != head) { | |
509 | qh = list_entry(tmp, struct uhci_qh, list); | |
510 | ||
511 | tmp = tmp->next; | |
512 | ||
513 | out += uhci_show_qh(qh, out, len - (out - buf), 4); | |
514 | } | |
515 | ||
516 | if (i < UHCI_NUM_SKELQH - 1) { | |
517 | if (qh->link != | |
518 | (cpu_to_le32(uhci->skelqh[j]->dma_handle) | UHCI_PTR_QH)) | |
519 | out += sprintf(out, " last QH not linked to next skeleton!\n"); | |
520 | } | |
521 | } | |
522 | ||
523 | if (debug > 2) | |
524 | out += uhci_show_lists(uhci, out, len - (out - buf)); | |
525 | ||
526 | spin_unlock_irqrestore(&uhci->lock, flags); | |
527 | ||
528 | return out - buf; | |
529 | } | |
530 | ||
531 | #define MAX_OUTPUT (64 * 1024) | |
532 | ||
533 | struct uhci_debug { | |
534 | int size; | |
535 | char *data; | |
536 | struct uhci_hcd *uhci; | |
537 | }; | |
538 | ||
539 | static int uhci_debug_open(struct inode *inode, struct file *file) | |
540 | { | |
541 | struct uhci_hcd *uhci = inode->u.generic_ip; | |
542 | struct uhci_debug *up; | |
543 | int ret = -ENOMEM; | |
544 | ||
545 | lock_kernel(); | |
546 | up = kmalloc(sizeof(*up), GFP_KERNEL); | |
547 | if (!up) | |
548 | goto out; | |
549 | ||
550 | up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL); | |
551 | if (!up->data) { | |
552 | kfree(up); | |
553 | goto out; | |
554 | } | |
555 | ||
556 | up->size = uhci_sprint_schedule(uhci, up->data, MAX_OUTPUT); | |
557 | ||
558 | file->private_data = up; | |
559 | ||
560 | ret = 0; | |
561 | out: | |
562 | unlock_kernel(); | |
563 | return ret; | |
564 | } | |
565 | ||
566 | static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence) | |
567 | { | |
568 | struct uhci_debug *up; | |
569 | loff_t new = -1; | |
570 | ||
571 | lock_kernel(); | |
572 | up = file->private_data; | |
573 | ||
574 | switch (whence) { | |
575 | case 0: | |
576 | new = off; | |
577 | break; | |
578 | case 1: | |
579 | new = file->f_pos + off; | |
580 | break; | |
581 | } | |
582 | if (new < 0 || new > up->size) { | |
583 | unlock_kernel(); | |
584 | return -EINVAL; | |
585 | } | |
586 | unlock_kernel(); | |
587 | return (file->f_pos = new); | |
588 | } | |
589 | ||
590 | static ssize_t uhci_debug_read(struct file *file, char __user *buf, | |
591 | size_t nbytes, loff_t *ppos) | |
592 | { | |
593 | struct uhci_debug *up = file->private_data; | |
594 | return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size); | |
595 | } | |
596 | ||
597 | static int uhci_debug_release(struct inode *inode, struct file *file) | |
598 | { | |
599 | struct uhci_debug *up = file->private_data; | |
600 | ||
601 | kfree(up->data); | |
602 | kfree(up); | |
603 | ||
604 | return 0; | |
605 | } | |
606 | ||
607 | static struct file_operations uhci_debug_operations = { | |
608 | .open = uhci_debug_open, | |
609 | .llseek = uhci_debug_lseek, | |
610 | .read = uhci_debug_read, | |
611 | .release = uhci_debug_release, | |
612 | }; | |
613 | ||
614 | #else /* CONFIG_DEBUG_FS */ | |
615 | ||
616 | #define uhci_debug_operations (* (struct file_operations *) NULL) | |
617 | ||
618 | #endif |