Root/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c

1/*
2 * ADM5120 HCD (Host Controller Driver) for USB
3 *
4 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * This file was derived from: drivers/usb/host/ohci-dbg.c
7 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
8 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 *
14 */
15
16/*-------------------------------------------------------------------------*/
17
18static inline char *ed_typestring(int ed_type)
19{
20    switch (ed_type) {
21    case PIPE_CONTROL:
22        return "ctrl";
23    case PIPE_BULK:
24        return "bulk";
25    case PIPE_INTERRUPT:
26        return "intr";
27    case PIPE_ISOCHRONOUS:
28        return "isoc";
29    }
30    return "(bad ed_type)";
31}
32
33static inline char *ed_statestring(int state)
34{
35    switch (state) {
36    case ED_IDLE:
37        return "IDLE";
38    case ED_UNLINK:
39        return "UNLINK";
40    case ED_OPER:
41        return "OPER";
42    }
43    return "?STATE";
44}
45
46static inline char *pipestring(int pipe)
47{
48    return ed_typestring(usb_pipetype(pipe));
49}
50
51static inline char *td_pidstring(u32 info)
52{
53    switch (info & TD_DP) {
54    case TD_DP_SETUP:
55        return "SETUP";
56    case TD_DP_IN:
57        return "IN";
58    case TD_DP_OUT:
59        return "OUT";
60    }
61    return "?PID";
62}
63
64static inline char *td_togglestring(u32 info)
65{
66    switch (info & TD_T) {
67    case TD_T_DATA0:
68        return "DATA0";
69    case TD_T_DATA1:
70        return "DATA1";
71    case TD_T_CARRY:
72        return "CARRY";
73    }
74    return "?TOGGLE";
75}
76
77/*-------------------------------------------------------------------------*/
78
79#ifdef DEBUG
80
81/* debug| print the main components of an URB
82 * small: 0) header + data packets 1) just header
83 */
84static void __attribute__((unused))
85urb_print(struct admhcd *ahcd, struct urb *urb, char *str, int small, int status)
86{
87    unsigned int pipe = urb->pipe;
88
89    if (!urb->dev || !urb->dev->bus) {
90        admhc_dbg(ahcd, "%s URB: no dev", str);
91        return;
92    }
93
94#ifndef ADMHC_VERBOSE_DEBUG
95    if (status != 0)
96#endif
97    admhc_dbg(ahcd, "URB-%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d "
98            "stat=%d\n",
99            str,
100            urb,
101            usb_pipedevice(pipe),
102            usb_pipeendpoint(pipe),
103            usb_pipeout(pipe) ? "out" : "in",
104            pipestring(pipe),
105            urb->transfer_flags,
106            urb->actual_length,
107            urb->transfer_buffer_length,
108            status);
109
110#ifdef ADMHC_VERBOSE_DEBUG
111    if (!small) {
112        int i, len;
113
114        if (usb_pipecontrol(pipe)) {
115            admhc_dbg(ahcd, "setup(8):");
116            for (i = 0; i < 8 ; i++)
117                printk(KERN_INFO" %02x", ((__u8 *)urb->setup_packet)[i]);
118            printk(KERN_INFO "\n");
119        }
120        if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
121            admhc_dbg(ahcd, "data(%d/%d):",
122                urb->actual_length,
123                urb->transfer_buffer_length);
124            len = usb_pipeout(pipe) ?
125                        urb->transfer_buffer_length : urb->actual_length;
126            for (i = 0; i < 16 && i < len; i++)
127                printk(KERN_INFO " %02x", ((__u8 *)urb->transfer_buffer)[i]);
128            printk(KERN_INFO "%s stat:%d\n", i < len ? "..." : "", status);
129        }
130    }
131#endif /* ADMHC_VERBOSE_DEBUG */
132}
133
134#define admhc_dbg_sw(ahcd, next, size, format, arg...) \
135    do { \
136        if (next) { \
137            unsigned s_len; \
138            s_len = scnprintf(*next, *size, format, ## arg); \
139            *size -= s_len; *next += s_len; \
140        } else \
141            admhc_dbg(ahcd, format, ## arg); \
142    } while (0);
143
144
145static void admhc_dump_intr_mask(struct admhcd *ahcd, char *label, u32 mask,
146        char **next, unsigned *size)
147{
148    admhc_dbg_sw(ahcd, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n",
149        label,
150        mask,
151        (mask & ADMHC_INTR_INTA) ? " INTA" : "",
152        (mask & ADMHC_INTR_FATI) ? " FATI" : "",
153        (mask & ADMHC_INTR_SWI) ? " SWI" : "",
154        (mask & ADMHC_INTR_TDC) ? " TDC" : "",
155        (mask & ADMHC_INTR_FNO) ? " FNO" : "",
156        (mask & ADMHC_INTR_SO) ? " SO" : "",
157        (mask & ADMHC_INTR_INSM) ? " INSM" : "",
158        (mask & ADMHC_INTR_BABI) ? " BABI" : "",
159        (mask & ADMHC_INTR_7) ? " !7!" : "",
160        (mask & ADMHC_INTR_6) ? " !6!" : "",
161        (mask & ADMHC_INTR_RESI) ? " RESI" : "",
162        (mask & ADMHC_INTR_SOFI) ? " SOFI" : ""
163        );
164}
165
166static void maybe_print_eds(struct admhcd *ahcd, char *label, u32 value,
167        char **next, unsigned *size)
168{
169    if (value)
170        admhc_dbg_sw(ahcd, next, size, "%s %08x\n", label, value);
171}
172
173static char *buss2string(int state)
174{
175    switch (state) {
176    case ADMHC_BUSS_RESET:
177        return "reset";
178    case ADMHC_BUSS_RESUME:
179        return "resume";
180    case ADMHC_BUSS_OPER:
181        return "operational";
182    case ADMHC_BUSS_SUSPEND:
183        return "suspend";
184    }
185    return "?state";
186}
187
188static void
189admhc_dump_status(struct admhcd *ahcd, char **next, unsigned *size)
190{
191    struct admhcd_regs __iomem *regs = ahcd->regs;
192    u32 temp;
193
194    temp = admhc_readl(ahcd, &regs->gencontrol);
195    admhc_dbg_sw(ahcd, next, size,
196        "gencontrol 0x%08x%s%s%s%s\n",
197        temp,
198        (temp & ADMHC_CTRL_UHFE) ? " UHFE" : "",
199        (temp & ADMHC_CTRL_SIR) ? " SIR" : "",
200        (temp & ADMHC_CTRL_DMAA) ? " DMAA" : "",
201        (temp & ADMHC_CTRL_SR) ? " SR" : ""
202        );
203
204    temp = admhc_readl(ahcd, &regs->host_control);
205    admhc_dbg_sw(ahcd, next, size,
206        "host_control 0x%08x BUSS=%s%s\n",
207        temp,
208        buss2string(temp & ADMHC_HC_BUSS),
209        (temp & ADMHC_HC_DMAE) ? " DMAE" : ""
210        );
211
212    admhc_dump_intr_mask(ahcd, "int_status",
213            admhc_readl(ahcd, &regs->int_status),
214            next, size);
215    admhc_dump_intr_mask(ahcd, "int_enable",
216            admhc_readl(ahcd, &regs->int_enable),
217            next, size);
218
219    maybe_print_eds(ahcd, "hosthead",
220            admhc_readl(ahcd, &regs->hosthead), next, size);
221}
222
223#define dbg_port_sw(hc, num, value, next, size) \
224    admhc_dbg_sw(hc, next, size, \
225        "portstatus [%d] " \
226        "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
227        num, temp, \
228        (temp & ADMHC_PS_PRSC) ? " PRSC" : "", \
229        (temp & ADMHC_PS_OCIC) ? " OCIC" : "", \
230        (temp & ADMHC_PS_PSSC) ? " PSSC" : "", \
231        (temp & ADMHC_PS_PESC) ? " PESC" : "", \
232        (temp & ADMHC_PS_CSC) ? " CSC" : "", \
233        \
234        (temp & ADMHC_PS_LSDA) ? " LSDA" : "", \
235        (temp & ADMHC_PS_PPS) ? " PPS" : "", \
236        (temp & ADMHC_PS_PRS) ? " PRS" : "", \
237        (temp & ADMHC_PS_POCI) ? " POCI" : "", \
238        (temp & ADMHC_PS_PSS) ? " PSS" : "", \
239        \
240        (temp & ADMHC_PS_PES) ? " PES" : "", \
241        (temp & ADMHC_PS_CCS) ? " CCS" : "" \
242        );
243
244
245static void
246admhc_dump_roothub(
247    struct admhcd *ahcd,
248    int verbose,
249    char **next,
250    unsigned *size)
251{
252    u32 temp, i;
253
254    temp = admhc_read_rhdesc(ahcd);
255    if (temp == ~(u32)0)
256        return;
257
258    if (verbose) {
259        admhc_dbg_sw(ahcd, next, size,
260            "rhdesc %08x%s%s%s%s%s%s PPCM=%02x%s%s%s%s NUMP=%d(%d)\n",
261            temp,
262            (temp & ADMHC_RH_CRWE) ? " CRWE" : "",
263            (temp & ADMHC_RH_OCIC) ? " OCIC" : "",
264            (temp & ADMHC_RH_LPSC) ? " LPSC" : "",
265            (temp & ADMHC_RH_LPSC) ? " DRWE" : "",
266            (temp & ADMHC_RH_LPSC) ? " OCI" : "",
267            (temp & ADMHC_RH_LPSC) ? " LPS" : "",
268            ((temp & ADMHC_RH_PPCM) >> 16),
269            (temp & ADMHC_RH_NOCP) ? " NOCP" : "",
270            (temp & ADMHC_RH_OCPM) ? " OCPM" : "",
271            (temp & ADMHC_RH_NPS) ? " NPS" : "",
272            (temp & ADMHC_RH_PSM) ? " PSM" : "",
273            (temp & ADMHC_RH_NUMP), ahcd->num_ports
274            );
275    }
276
277    for (i = 0; i < ahcd->num_ports; i++) {
278        temp = admhc_read_portstatus(ahcd, i);
279        dbg_port_sw(ahcd, i, temp, next, size);
280    }
281}
282
283static void admhc_dump(struct admhcd *ahcd, int verbose)
284{
285    admhc_dbg(ahcd, "ADMHC ahcd state\n");
286
287    /* dumps some of the state we know about */
288    admhc_dump_status(ahcd, NULL, NULL);
289    admhc_dbg(ahcd, "current frame #%04x\n",
290        admhc_frame_no(ahcd));
291
292    admhc_dump_roothub(ahcd, verbose, NULL, NULL);
293}
294
295static const char data0[] = "DATA0";
296static const char data1[] = "DATA1";
297
298static void admhc_dump_td(const struct admhcd *ahcd, const char *label,
299        const struct td *td)
300{
301    u32 tmp;
302
303    admhc_dbg(ahcd, "%s td %p; urb %p index %d; hwNextTD %08x\n",
304        label, td,
305        td->urb, td->index,
306        hc32_to_cpup(ahcd, &td->hwNextTD));
307
308    tmp = hc32_to_cpup(ahcd, &td->hwINFO);
309    admhc_dbg(ahcd, " status %08x%s CC=%x EC=%d %s %s ISI=%x FN=%x\n",
310        tmp,
311        (tmp & TD_OWN) ? " OWN" : "",
312        TD_CC_GET(tmp),
313        TD_EC_GET(tmp),
314        td_togglestring(tmp),
315        td_pidstring(tmp),
316        TD_ISI_GET(tmp),
317        TD_FN_GET(tmp));
318
319    tmp = hc32_to_cpup(ahcd, &td->hwCBL);
320    admhc_dbg(ahcd, " dbp %08x; cbl %08x; LEN=%d%s\n",
321        hc32_to_cpup(ahcd, &td->hwDBP),
322        tmp,
323        TD_BL_GET(tmp),
324        (tmp & TD_IE) ? " IE" : "");
325}
326
327/* caller MUST own hcd spinlock if verbose is set! */
328static void __attribute__((unused))
329admhc_dump_ed(const struct admhcd *ahcd, const char *label,
330        const struct ed *ed, int verbose)
331{
332    u32 tmp = hc32_to_cpu(ahcd, ed->hwINFO);
333
334    admhc_dbg(ahcd, "%s ed %p %s type %s; next ed %08x\n",
335        label,
336        ed, ed_statestring(ed->state), ed_typestring(ed->type),
337        hc32_to_cpup(ahcd, &ed->hwNextED));
338
339    admhc_dbg(ahcd, " info %08x MAX=%d%s%s%s%s EP=%d DEV=%d\n", tmp,
340        ED_MPS_GET(tmp),
341        (tmp & ED_ISO) ? " ISO" : "",
342        (tmp & ED_SKIP) ? " SKIP" : "",
343        (tmp & ED_SPEED_FULL) ? " FULL" : " LOW",
344        (tmp & ED_INT) ? " INT" : "",
345        ED_EN_GET(tmp),
346        ED_FA_GET(tmp));
347
348    tmp = hc32_to_cpup(ahcd, &ed->hwHeadP);
349    admhc_dbg(ahcd, " tds: head %08x tail %08x %s%s%s\n",
350        tmp & TD_MASK,
351        hc32_to_cpup(ahcd, &ed->hwTailP),
352        (tmp & ED_C) ? data1 : data0,
353        (tmp & ED_H) ? " HALT" : "",
354        verbose ? " td list follows" : " (not listing)");
355
356    if (verbose) {
357        struct list_head *tmp;
358
359        /* use ed->td_list because HC concurrently modifies
360         * hwNextTD as it accumulates ed_donelist.
361         */
362        list_for_each(tmp, &ed->td_list) {
363            struct td *td;
364            td = list_entry(tmp, struct td, td_list);
365            admhc_dump_td(ahcd, " ->", td);
366        }
367    }
368}
369
370#else /* ifdef DEBUG */
371
372static inline void urb_print(struct admhcd *ahcd, struct urb * urb, char * str,
373    int small, int status) {}
374static inline void admhc_dump_ed(const struct admhcd *ahcd, const char *label,
375    const struct ed *ed, int verbose) {}
376static inline void admhc_dump_td(const struct admhcd *ahcd, const char *label,
377    const struct td *td) {}
378static inline void admhc_dump(struct admhcd *ahcd, int verbose) {}
379
380#undef ADMHC_VERBOSE_DEBUG
381
382#endif /* DEBUG */
383
384/*-------------------------------------------------------------------------*/
385
386#ifdef STUB_DEBUG_FILES
387
388static inline void create_debug_files(struct admhcd *bus) { }
389static inline void remove_debug_files(struct admhcd *bus) { }
390
391#else
392
393static int debug_async_open(struct inode *, struct file *);
394static int debug_periodic_open(struct inode *, struct file *);
395static int debug_registers_open(struct inode *, struct file *);
396static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
397static int debug_close(struct inode *, struct file *);
398
399static const struct file_operations debug_async_fops = {
400    .owner = THIS_MODULE,
401    .open = debug_async_open,
402    .read = debug_output,
403    .release = debug_close,
404    .llseek = default_llseek,
405};
406static const struct file_operations debug_periodic_fops = {
407    .owner = THIS_MODULE,
408    .open = debug_periodic_open,
409    .read = debug_output,
410    .release = debug_close,
411    .llseek = default_llseek,
412};
413static const struct file_operations debug_registers_fops = {
414    .owner = THIS_MODULE,
415    .open = debug_registers_open,
416    .read = debug_output,
417    .release = debug_close,
418    .llseek = default_llseek,
419};
420
421static struct dentry *admhc_debug_root;
422
423struct debug_buffer {
424    ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
425    struct admhcd *ahcd;
426    struct mutex mutex; /* protect filling of buffer */
427    size_t count; /* number of characters filled into buffer */
428    char *page;
429};
430
431static ssize_t
432show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
433{
434    unsigned temp;
435    unsigned size = count;
436
437    if (!ed)
438        return 0;
439
440    /* dump a snapshot of the bulk or control schedule */
441    while (ed) {
442        u32 info = hc32_to_cpu(ahcd, ed->hwINFO);
443        u32 headp = hc32_to_cpu(ahcd, ed->hwHeadP);
444        u32 tailp = hc32_to_cpu(ahcd, ed->hwTailP);
445        struct list_head *entry;
446        struct td *td;
447
448        temp = scnprintf(buf, size,
449            "ed/%p %s %s %cs dev%d ep%d %s%smax %d %08x%s%s %s"
450            " h:%08x t:%08x",
451            ed,
452            ed_statestring(ed->state),
453            ed_typestring(ed->type),
454            (info & ED_SPEED_FULL) ? 'f' : 'l',
455            info & ED_FA_MASK,
456            (info >> ED_EN_SHIFT) & ED_EN_MASK,
457            (info & ED_INT) ? "INT " : "",
458            (info & ED_ISO) ? "ISO " : "",
459            (info >> ED_MPS_SHIFT) & ED_MPS_MASK ,
460            info,
461            (info & ED_SKIP) ? " S" : "",
462            (headp & ED_H) ? " H" : "",
463            (headp & ED_C) ? data1 : data0,
464            headp & ED_MASK, tailp);
465        size -= temp;
466        buf += temp;
467
468        list_for_each(entry, &ed->td_list) {
469            u32 dbp, cbl;
470
471            td = list_entry(entry, struct td, td_list);
472            info = hc32_to_cpup(ahcd, &td->hwINFO);
473            dbp = hc32_to_cpup(ahcd, &td->hwDBP);
474            cbl = hc32_to_cpup(ahcd, &td->hwCBL);
475
476            temp = scnprintf(buf, size,
477                "\n\ttd/%p %s %d %s%scc=%x urb %p (%08x,%08x)",
478                td,
479                td_pidstring(info),
480                TD_BL_GET(cbl),
481                (info & TD_OWN) ? "" : "DONE ",
482                (cbl & TD_IE) ? "IE " : "",
483                TD_CC_GET(info), td->urb, info, cbl);
484            size -= temp;
485            buf += temp;
486        }
487
488        temp = scnprintf(buf, size, "\n");
489        size -= temp;
490        buf += temp;
491
492        ed = ed->ed_next;
493    }
494
495    return count - size;
496}
497
498static ssize_t fill_async_buffer(struct debug_buffer *buf)
499{
500    struct admhcd *ahcd;
501    size_t temp;
502    unsigned long flags;
503
504    ahcd = buf->ahcd;
505
506    spin_lock_irqsave(&ahcd->lock, flags);
507    temp = show_list(ahcd, buf->page, PAGE_SIZE, ahcd->ed_head);
508    spin_unlock_irqrestore(&ahcd->lock, flags);
509
510    return temp;
511}
512
513
514#define DBG_SCHED_LIMIT 64
515
516static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
517{
518    struct admhcd *ahcd;
519    struct ed **seen, *ed;
520    unsigned long flags;
521    unsigned temp, size, seen_count;
522    char *next;
523    unsigned i;
524
525    seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC);
526    if (!seen)
527        return 0;
528    seen_count = 0;
529
530    ahcd = buf->ahcd;
531    next = buf->page;
532    size = PAGE_SIZE;
533
534    temp = scnprintf(next, size, "size = %d\n", NUM_INTS);
535    size -= temp;
536    next += temp;
537
538    /* dump a snapshot of the periodic schedule (and load) */
539    spin_lock_irqsave(&ahcd->lock, flags);
540    for (i = 0; i < NUM_INTS; i++) {
541        ed = ahcd->periodic[i];
542        if (!ed)
543            continue;
544
545        temp = scnprintf(next, size, "%2d [%3d]:", i, ahcd->load[i]);
546        size -= temp;
547        next += temp;
548
549        do {
550            temp = scnprintf(next, size, " ed%d/%p",
551                ed->interval, ed);
552            size -= temp;
553            next += temp;
554            for (temp = 0; temp < seen_count; temp++) {
555                if (seen[temp] == ed)
556                    break;
557            }
558
559            /* show more info the first time around */
560            if (temp == seen_count) {
561                u32 info = hc32_to_cpu(ahcd, ed->hwINFO);
562                struct list_head *entry;
563                unsigned qlen = 0;
564
565                /* qlen measured here in TDs, not urbs */
566                list_for_each(entry, &ed->td_list)
567                    qlen++;
568                temp = scnprintf(next, size,
569                    " (%cs dev%d ep%d%s qlen %u"
570                    " max %d %08x%s%s)",
571                    (info & ED_SPEED_FULL) ? 'f' : 'l',
572                    ED_FA_GET(info),
573                    ED_EN_GET(info),
574                    (info & ED_ISO) ? "iso" : "int",
575                    qlen,
576                    ED_MPS_GET(info),
577                    info,
578                    (info & ED_SKIP) ? " K" : "",
579                    (ed->hwHeadP &
580                        cpu_to_hc32(ahcd, ED_H)) ?
581                            " H" : "");
582                size -= temp;
583                next += temp;
584
585                if (seen_count < DBG_SCHED_LIMIT)
586                    seen[seen_count++] = ed;
587
588                ed = ed->ed_next;
589
590            } else {
591                /* we've seen it and what's after */
592                temp = 0;
593                ed = NULL;
594            }
595
596        } while (ed);
597
598        temp = scnprintf(next, size, "\n");
599        size -= temp;
600        next += temp;
601    }
602    spin_unlock_irqrestore(&ahcd->lock, flags);
603    kfree(seen);
604
605    return PAGE_SIZE - size;
606}
607
608
609#undef DBG_SCHED_LIMIT
610
611static ssize_t fill_registers_buffer(struct debug_buffer *buf)
612{
613    struct usb_hcd *hcd;
614    struct admhcd *ahcd;
615    struct admhcd_regs __iomem *regs;
616    unsigned long flags;
617    unsigned temp, size;
618    char *next;
619    u32 rdata;
620
621    ahcd = buf->ahcd;
622    hcd = admhc_to_hcd(ahcd);
623    regs = ahcd->regs;
624    next = buf->page;
625    size = PAGE_SIZE;
626
627    spin_lock_irqsave(&ahcd->lock, flags);
628
629    /* dump driver info, then registers in spec order */
630
631    admhc_dbg_sw(ahcd, &next, &size,
632        "bus %s, device %s\n"
633        "%s\n"
634        "%s\n",
635        hcd->self.controller->bus->name,
636        dev_name(hcd->self.controller),
637        hcd->product_desc,
638        hcd_name);
639
640    if (!HCD_HW_ACCESSIBLE(hcd)) {
641        size -= scnprintf(next, size,
642            "SUSPENDED (no register access)\n");
643        goto done;
644    }
645
646    admhc_dump_status(ahcd, &next, &size);
647
648    /* other registers mostly affect frame timings */
649    rdata = admhc_readl(ahcd, &regs->fminterval);
650    temp = scnprintf(next, size,
651            "fmintvl 0x%08x %sFSLDP=0x%04x FI=0x%04x\n",
652            rdata, (rdata & ADMHC_SFI_FIT) ? "FIT " : "",
653            (rdata >> ADMHC_SFI_FSLDP_SHIFT) & ADMHC_SFI_FSLDP_MASK,
654            rdata & ADMHC_SFI_FI_MASK);
655    size -= temp;
656    next += temp;
657
658    rdata = admhc_readl(ahcd, &regs->fmnumber);
659    temp = scnprintf(next, size, "fmnumber 0x%08x %sFR=0x%04x FN=%04x\n",
660            rdata, (rdata & ADMHC_SFN_FRT) ? "FRT " : "",
661            (rdata >> ADMHC_SFN_FR_SHIFT) & ADMHC_SFN_FR_MASK,
662            rdata & ADMHC_SFN_FN_MASK);
663    size -= temp;
664    next += temp;
665
666    /* TODO: use predefined bitmask */
667    rdata = admhc_readl(ahcd, &regs->lsthresh);
668    temp = scnprintf(next, size, "lsthresh 0x%04x\n",
669            rdata & 0x3fff);
670    size -= temp;
671    next += temp;
672
673    temp = scnprintf(next, size, "hub poll timer: %s\n",
674            admhcd_to_hcd(ahcd)->poll_rh ? "ON" : "OFF");
675    size -= temp;
676    next += temp;
677
678    /* roothub */
679    admhc_dump_roothub(ahcd, 1, &next, &size);
680
681done:
682    spin_unlock_irqrestore(&ahcd->lock, flags);
683    return PAGE_SIZE - size;
684}
685
686
687static struct debug_buffer *alloc_buffer(struct admhcd *ahcd,
688                ssize_t (*fill_func)(struct debug_buffer *))
689{
690    struct debug_buffer *buf;
691
692    buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
693
694    if (buf) {
695        buf->ahcd = ahcd;
696        buf->fill_func = fill_func;
697        mutex_init(&buf->mutex);
698    }
699
700    return buf;
701}
702
703static int fill_buffer(struct debug_buffer *buf)
704{
705    int ret = 0;
706
707    if (!buf->page)
708        buf->page = (char *)get_zeroed_page(GFP_KERNEL);
709
710    if (!buf->page) {
711        ret = -ENOMEM;
712        goto out;
713    }
714
715    ret = buf->fill_func(buf);
716
717    if (ret >= 0) {
718        buf->count = ret;
719        ret = 0;
720    }
721
722out:
723    return ret;
724}
725
726static ssize_t debug_output(struct file *file, char __user *user_buf,
727            size_t len, loff_t *offset)
728{
729    struct debug_buffer *buf = file->private_data;
730    int ret = 0;
731
732    mutex_lock(&buf->mutex);
733    if (buf->count == 0) {
734        ret = fill_buffer(buf);
735        if (ret != 0) {
736            mutex_unlock(&buf->mutex);
737            goto out;
738        }
739    }
740    mutex_unlock(&buf->mutex);
741
742    ret = simple_read_from_buffer(user_buf, len, offset,
743                    buf->page, buf->count);
744
745out:
746    return ret;
747}
748
749static int debug_close(struct inode *inode, struct file *file)
750{
751    struct debug_buffer *buf = file->private_data;
752
753    if (buf) {
754        if (buf->page)
755            free_page((unsigned long)buf->page);
756        kfree(buf);
757    }
758
759    return 0;
760}
761
762static int debug_async_open(struct inode *inode, struct file *file)
763{
764    file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
765
766    return file->private_data ? 0 : -ENOMEM;
767}
768
769static int debug_periodic_open(struct inode *inode, struct file *file)
770{
771    file->private_data = alloc_buffer(inode->i_private,
772                        fill_periodic_buffer);
773
774    return file->private_data ? 0 : -ENOMEM;
775}
776
777static int debug_registers_open(struct inode *inode, struct file *file)
778{
779    file->private_data = alloc_buffer(inode->i_private,
780                        fill_registers_buffer);
781
782    return file->private_data ? 0 : -ENOMEM;
783}
784
785static inline void create_debug_files(struct admhcd *ahcd)
786{
787    struct usb_bus *bus = &admhcd_to_hcd(ahcd)->self;
788
789    ahcd->debug_dir = debugfs_create_dir(bus->bus_name, admhc_debug_root);
790    if (!ahcd->debug_dir)
791        goto dir_error;
792
793    ahcd->debug_async = debugfs_create_file("async", S_IRUGO,
794                        ahcd->debug_dir, ahcd,
795                        &debug_async_fops);
796    if (!ahcd->debug_async)
797        goto async_error;
798
799    ahcd->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
800                        ahcd->debug_dir, ahcd,
801                        &debug_periodic_fops);
802    if (!ahcd->debug_periodic)
803        goto periodic_error;
804
805    ahcd->debug_registers = debugfs_create_file("registers", S_IRUGO,
806                        ahcd->debug_dir, ahcd,
807                        &debug_registers_fops);
808    if (!ahcd->debug_registers)
809        goto registers_error;
810
811    admhc_dbg(ahcd, "created debug files\n");
812    return;
813
814registers_error:
815    debugfs_remove(ahcd->debug_periodic);
816periodic_error:
817    debugfs_remove(ahcd->debug_async);
818async_error:
819    debugfs_remove(ahcd->debug_dir);
820dir_error:
821    ahcd->debug_periodic = NULL;
822    ahcd->debug_async = NULL;
823    ahcd->debug_dir = NULL;
824}
825
826static inline void remove_debug_files(struct admhcd *ahcd)
827{
828    debugfs_remove(ahcd->debug_registers);
829    debugfs_remove(ahcd->debug_periodic);
830    debugfs_remove(ahcd->debug_async);
831    debugfs_remove(ahcd->debug_dir);
832}
833
834#endif
835
836/*-------------------------------------------------------------------------*/
837

Archive Download this file

Branches:
backfire
history
master
release_2010-11-17
release_2010-12-14
release_2011-02-23
release_2011-05-28
release_2011-08-27
release_2011-11-13
release_2012-03-18
release_2012-04-09
release_2012-10-11
uclibc_nptl



interactive