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linux-sg2042/drivers/usb/host/ohci-dbg.c

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/*
* OHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
*
* This file is licenced under the GPL.
*/
/*-------------------------------------------------------------------------*/
#ifdef DEBUG
#define edstring(ed_type) ({ char *temp; \
switch (ed_type) { \
case PIPE_CONTROL: temp = "ctrl"; break; \
case PIPE_BULK: temp = "bulk"; break; \
case PIPE_INTERRUPT: temp = "intr"; break; \
default: temp = "isoc"; break; \
}; temp;})
#define pipestring(pipe) edstring(usb_pipetype(pipe))
/* debug| print the main components of an URB
* small: 0) header + data packets 1) just header
*/
static void __maybe_unused
urb_print(struct urb * urb, char * str, int small, int status)
{
unsigned int pipe= urb->pipe;
if (!urb->dev || !urb->dev->bus) {
dbg("%s URB: no dev", str);
return;
}
#ifndef OHCI_VERBOSE_DEBUG
if (status != 0)
#endif
dbg("%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d stat=%d",
str,
urb,
usb_pipedevice (pipe),
usb_pipeendpoint (pipe),
usb_pipeout (pipe)? "out" : "in",
pipestring (pipe),
urb->transfer_flags,
urb->actual_length,
urb->transfer_buffer_length,
status);
#ifdef OHCI_VERBOSE_DEBUG
if (!small) {
int i, len;
if (usb_pipecontrol (pipe)) {
printk (KERN_DEBUG __FILE__ ": setup(8):");
for (i = 0; i < 8 ; i++)
printk (" %02x", ((__u8 *) urb->setup_packet) [i]);
printk ("\n");
}
if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
printk (KERN_DEBUG __FILE__ ": data(%d/%d):",
urb->actual_length,
urb->transfer_buffer_length);
len = usb_pipeout (pipe)?
urb->transfer_buffer_length: urb->actual_length;
for (i = 0; i < 16 && i < len; i++)
printk (" %02x", ((__u8 *) urb->transfer_buffer) [i]);
printk ("%s stat:%d\n", i < len? "...": "", status);
}
}
#endif
}
#define ohci_dbg_sw(ohci, next, size, format, arg...) \
do { \
if (next != NULL) { \
unsigned s_len; \
s_len = scnprintf (*next, *size, format, ## arg ); \
*size -= s_len; *next += s_len; \
} else \
ohci_dbg(ohci,format, ## arg ); \
} while (0);
static void ohci_dump_intr_mask (
struct ohci_hcd *ohci,
char *label,
u32 mask,
char **next,
unsigned *size)
{
ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
label,
mask,
(mask & OHCI_INTR_MIE) ? " MIE" : "",
(mask & OHCI_INTR_OC) ? " OC" : "",
(mask & OHCI_INTR_RHSC) ? " RHSC" : "",
(mask & OHCI_INTR_FNO) ? " FNO" : "",
(mask & OHCI_INTR_UE) ? " UE" : "",
(mask & OHCI_INTR_RD) ? " RD" : "",
(mask & OHCI_INTR_SF) ? " SF" : "",
(mask & OHCI_INTR_WDH) ? " WDH" : "",
(mask & OHCI_INTR_SO) ? " SO" : ""
);
}
static void maybe_print_eds (
struct ohci_hcd *ohci,
char *label,
u32 value,
char **next,
unsigned *size)
{
if (value)
ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
}
static char *hcfs2string (int state)
{
switch (state) {
case OHCI_USB_RESET: return "reset";
case OHCI_USB_RESUME: return "resume";
case OHCI_USB_OPER: return "operational";
case OHCI_USB_SUSPEND: return "suspend";
}
return "?";
}
// dump control and status registers
static void
ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
{
struct ohci_regs __iomem *regs = controller->regs;
u32 temp;
temp = ohci_readl (controller, &regs->revision) & 0xff;
ohci_dbg_sw (controller, next, size,
"OHCI %d.%d, %s legacy support registers\n",
0x03 & (temp >> 4), (temp & 0x0f),
(temp & 0x0100) ? "with" : "NO");
temp = ohci_readl (controller, &regs->control);
ohci_dbg_sw (controller, next, size,
"control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
temp,
(temp & OHCI_CTRL_RWE) ? " RWE" : "",
(temp & OHCI_CTRL_RWC) ? " RWC" : "",
(temp & OHCI_CTRL_IR) ? " IR" : "",
hcfs2string (temp & OHCI_CTRL_HCFS),
(temp & OHCI_CTRL_BLE) ? " BLE" : "",
(temp & OHCI_CTRL_CLE) ? " CLE" : "",
(temp & OHCI_CTRL_IE) ? " IE" : "",
(temp & OHCI_CTRL_PLE) ? " PLE" : "",
temp & OHCI_CTRL_CBSR
);
temp = ohci_readl (controller, &regs->cmdstatus);
ohci_dbg_sw (controller, next, size,
"cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
(temp & OHCI_SOC) >> 16,
(temp & OHCI_OCR) ? " OCR" : "",
(temp & OHCI_BLF) ? " BLF" : "",
(temp & OHCI_CLF) ? " CLF" : "",
(temp & OHCI_HCR) ? " HCR" : ""
);
ohci_dump_intr_mask (controller, "intrstatus",
ohci_readl (controller, &regs->intrstatus),
next, size);
ohci_dump_intr_mask (controller, "intrenable",
ohci_readl (controller, &regs->intrenable),
next, size);
// intrdisable always same as intrenable
maybe_print_eds (controller, "ed_periodcurrent",
ohci_readl (controller, &regs->ed_periodcurrent),
next, size);
maybe_print_eds (controller, "ed_controlhead",
ohci_readl (controller, &regs->ed_controlhead),
next, size);
maybe_print_eds (controller, "ed_controlcurrent",
ohci_readl (controller, &regs->ed_controlcurrent),
next, size);
maybe_print_eds (controller, "ed_bulkhead",
ohci_readl (controller, &regs->ed_bulkhead),
next, size);
maybe_print_eds (controller, "ed_bulkcurrent",
ohci_readl (controller, &regs->ed_bulkcurrent),
next, size);
maybe_print_eds (controller, "donehead",
ohci_readl (controller, &regs->donehead), next, size);
}
#define dbg_port_sw(hc,num,value,next,size) \
ohci_dbg_sw (hc, next, size, \
"roothub.portstatus [%d] " \
"0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
num, temp, \
(temp & RH_PS_PRSC) ? " PRSC" : "", \
(temp & RH_PS_OCIC) ? " OCIC" : "", \
(temp & RH_PS_PSSC) ? " PSSC" : "", \
(temp & RH_PS_PESC) ? " PESC" : "", \
(temp & RH_PS_CSC) ? " CSC" : "", \
\
(temp & RH_PS_LSDA) ? " LSDA" : "", \
(temp & RH_PS_PPS) ? " PPS" : "", \
(temp & RH_PS_PRS) ? " PRS" : "", \
(temp & RH_PS_POCI) ? " POCI" : "", \
(temp & RH_PS_PSS) ? " PSS" : "", \
\
(temp & RH_PS_PES) ? " PES" : "", \
(temp & RH_PS_CCS) ? " CCS" : "" \
);
static void
ohci_dump_roothub (
struct ohci_hcd *controller,
int verbose,
char **next,
unsigned *size)
{
u32 temp, i;
temp = roothub_a (controller);
if (temp == ~(u32)0)
return;
if (verbose) {
ohci_dbg_sw (controller, next, size,
"roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp,
((temp & RH_A_POTPGT) >> 24) & 0xff,
(temp & RH_A_NOCP) ? " NOCP" : "",
(temp & RH_A_OCPM) ? " OCPM" : "",
(temp & RH_A_DT) ? " DT" : "",
(temp & RH_A_NPS) ? " NPS" : "",
(temp & RH_A_PSM) ? " PSM" : "",
(temp & RH_A_NDP), controller->num_ports
);
temp = roothub_b (controller);
ohci_dbg_sw (controller, next, size,
"roothub.b %08x PPCM=%04x DR=%04x\n",
temp,
(temp & RH_B_PPCM) >> 16,
(temp & RH_B_DR)
);
temp = roothub_status (controller);
ohci_dbg_sw (controller, next, size,
"roothub.status %08x%s%s%s%s%s%s\n",
temp,
(temp & RH_HS_CRWE) ? " CRWE" : "",
(temp & RH_HS_OCIC) ? " OCIC" : "",
(temp & RH_HS_LPSC) ? " LPSC" : "",
(temp & RH_HS_DRWE) ? " DRWE" : "",
(temp & RH_HS_OCI) ? " OCI" : "",
(temp & RH_HS_LPS) ? " LPS" : ""
);
}
for (i = 0; i < controller->num_ports; i++) {
temp = roothub_portstatus (controller, i);
dbg_port_sw (controller, i, temp, next, size);
}
}
static void ohci_dump (struct ohci_hcd *controller, int verbose)
{
ohci_dbg (controller, "OHCI controller state\n");
// dumps some of the state we know about
ohci_dump_status (controller, NULL, NULL);
if (controller->hcca)
ohci_dbg (controller,
"hcca frame #%04x\n", ohci_frame_no(controller));
ohci_dump_roothub (controller, 1, NULL, NULL);
}
static const char data0 [] = "DATA0";
static const char data1 [] = "DATA1";
static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
const struct td *td)
{
u32 tmp = hc32_to_cpup (ohci, &td->hwINFO);
ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
label, td,
(tmp & TD_DONE) ? " (DONE)" : "",
td->urb, td->index,
hc32_to_cpup (ohci, &td->hwNextTD));
if ((tmp & TD_ISO) == 0) {
const char *toggle, *pid;
u32 cbp, be;
switch (tmp & TD_T) {
case TD_T_DATA0: toggle = data0; break;
case TD_T_DATA1: toggle = data1; break;
case TD_T_TOGGLE: toggle = "(CARRY)"; break;
default: toggle = "(?)"; break;
}
switch (tmp & TD_DP) {
case TD_DP_SETUP: pid = "SETUP"; break;
case TD_DP_IN: pid = "IN"; break;
case TD_DP_OUT: pid = "OUT"; break;
default: pid = "(bad pid)"; break;
}
ohci_dbg (ohci, " info %08x CC=%x %s DI=%d %s %s\n", tmp,
TD_CC_GET(tmp), /* EC, */ toggle,
(tmp & TD_DI) >> 21, pid,
(tmp & TD_R) ? "R" : "");
cbp = hc32_to_cpup (ohci, &td->hwCBP);
be = hc32_to_cpup (ohci, &td->hwBE);
ohci_dbg (ohci, " cbp %08x be %08x (len %d)\n", cbp, be,
cbp ? (be + 1 - cbp) : 0);
} else {
unsigned i;
ohci_dbg (ohci, " info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
TD_CC_GET(tmp),
(tmp >> 24) & 0x07,
(tmp & TD_DI) >> 21,
tmp & 0x0000ffff);
ohci_dbg (ohci, " bp0 %08x be %08x\n",
hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
hc32_to_cpup (ohci, &td->hwBE));
for (i = 0; i < MAXPSW; i++) {
u16 psw = ohci_hwPSW (ohci, td, i);
int cc = (psw >> 12) & 0x0f;
ohci_dbg (ohci, " psw [%d] = %2x, CC=%x %s=%d\n", i,
psw, cc,
(cc >= 0x0e) ? "OFFSET" : "SIZE",
psw & 0x0fff);
}
}
}
/* caller MUST own hcd spinlock if verbose is set! */
static void __maybe_unused
ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
const struct ed *ed, int verbose)
{
u32 tmp = hc32_to_cpu (ohci, ed->hwINFO);
char *type = "";
ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
label,
ed, ed->state, edstring (ed->type),
hc32_to_cpup (ohci, &ed->hwNextED));
switch (tmp & (ED_IN|ED_OUT)) {
case ED_OUT: type = "-OUT"; break;
case ED_IN: type = "-IN"; break;
/* else from TDs ... control */
}
ohci_dbg (ohci,
" info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
0x03ff & (tmp >> 16),
(tmp & ED_DEQUEUE) ? " DQ" : "",
(tmp & ED_ISO) ? " ISO" : "",
(tmp & ED_SKIP) ? " SKIP" : "",
(tmp & ED_LOWSPEED) ? " LOW" : "",
0x000f & (tmp >> 7),
type,
0x007f & tmp);
tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
ohci_dbg (ohci, " tds: head %08x %s%s tail %08x%s\n",
tmp,
(tmp & ED_C) ? data1 : data0,
(tmp & ED_H) ? " HALT" : "",
hc32_to_cpup (ohci, &ed->hwTailP),
verbose ? "" : " (not listing)");
if (verbose) {
struct list_head *tmp;
/* use ed->td_list because HC concurrently modifies
* hwNextTD as it accumulates ed_donelist.
*/
list_for_each (tmp, &ed->td_list) {
struct td *td;
td = list_entry (tmp, struct td, td_list);
ohci_dump_td (ohci, " ->", td);
}
}
}
#else
static inline void ohci_dump (struct ohci_hcd *controller, int verbose) {}
#undef OHCI_VERBOSE_DEBUG
#endif /* DEBUG */
/*-------------------------------------------------------------------------*/
#ifdef STUB_DEBUG_FILES
static inline void create_debug_files (struct ohci_hcd *bus) { }
static inline void remove_debug_files (struct ohci_hcd *bus) { }
#else
static int debug_async_open(struct inode *, struct file *);
static int debug_periodic_open(struct inode *, struct file *);
static int debug_registers_open(struct inode *, struct file *);
static int debug_async_open(struct inode *, struct file *);
static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
static int debug_close(struct inode *, struct file *);
static const struct file_operations debug_async_fops = {
.owner = THIS_MODULE,
.open = debug_async_open,
.read = debug_output,
.release = debug_close,
};
static const struct file_operations debug_periodic_fops = {
.owner = THIS_MODULE,
.open = debug_periodic_open,
.read = debug_output,
.release = debug_close,
};
static const struct file_operations debug_registers_fops = {
.owner = THIS_MODULE,
.open = debug_registers_open,
.read = debug_output,
.release = debug_close,
};
static struct dentry *ohci_debug_root;
struct debug_buffer {
ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
struct device *dev;
struct mutex mutex; /* protect filling of buffer */
size_t count; /* number of characters filled into buffer */
char *page;
};
static ssize_t
show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
{
unsigned temp, size = count;
if (!ed)
return 0;
/* print first --> last */
while (ed->ed_prev)
ed = ed->ed_prev;
/* dump a snapshot of the bulk or control schedule */
while (ed) {
u32 info = hc32_to_cpu (ohci, ed->hwINFO);
u32 headp = hc32_to_cpu (ohci, ed->hwHeadP);
struct list_head *entry;
struct td *td;
temp = scnprintf (buf, size,
"ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
ed,
(info & ED_LOWSPEED) ? 'l' : 'f',
info & 0x7f,
(info >> 7) & 0xf,
(info & ED_IN) ? "in" : "out",
0x03ff & (info >> 16),
info,
(info & ED_SKIP) ? " s" : "",
(headp & ED_H) ? " H" : "",
(headp & ED_C) ? data1 : data0);
size -= temp;
buf += temp;
list_for_each (entry, &ed->td_list) {
u32 cbp, be;
td = list_entry (entry, struct td, td_list);
info = hc32_to_cpup (ohci, &td->hwINFO);
cbp = hc32_to_cpup (ohci, &td->hwCBP);
be = hc32_to_cpup (ohci, &td->hwBE);
temp = scnprintf (buf, size,
"\n\ttd %p %s %d cc=%x urb %p (%08x)",
td,
({ char *pid;
switch (info & TD_DP) {
case TD_DP_SETUP: pid = "setup"; break;
case TD_DP_IN: pid = "in"; break;
case TD_DP_OUT: pid = "out"; break;
default: pid = "(?)"; break;
} pid;}),
cbp ? (be + 1 - cbp) : 0,
TD_CC_GET (info), td->urb, info);
size -= temp;
buf += temp;
}
temp = scnprintf (buf, size, "\n");
size -= temp;
buf += temp;
ed = ed->ed_next;
}
return count - size;
}
static ssize_t fill_async_buffer(struct debug_buffer *buf)
{
struct usb_bus *bus;
struct usb_hcd *hcd;
struct ohci_hcd *ohci;
size_t temp;
unsigned long flags;
bus = dev_get_drvdata(buf->dev);
hcd = bus_to_hcd(bus);
ohci = hcd_to_ohci(hcd);
/* display control and bulk lists together, for simplicity */
spin_lock_irqsave (&ohci->lock, flags);
temp = show_list(ohci, buf->page, buf->count, ohci->ed_controltail);
temp += show_list(ohci, buf->page + temp, buf->count - temp,
ohci->ed_bulktail);
spin_unlock_irqrestore (&ohci->lock, flags);
return temp;
}
#define DBG_SCHED_LIMIT 64
static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
{
struct usb_bus *bus;
struct usb_hcd *hcd;
struct ohci_hcd *ohci;
struct ed **seen, *ed;
unsigned long flags;
unsigned temp, size, seen_count;
char *next;
unsigned i;
if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
return 0;
seen_count = 0;
bus = (struct usb_bus *)dev_get_drvdata(buf->dev);
hcd = bus_to_hcd(bus);
ohci = hcd_to_ohci(hcd);
next = buf->page;
size = PAGE_SIZE;
temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
size -= temp;
next += temp;
/* dump a snapshot of the periodic schedule (and load) */
spin_lock_irqsave (&ohci->lock, flags);
for (i = 0; i < NUM_INTS; i++) {
if (!(ed = ohci->periodic [i]))
continue;
temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]);
size -= temp;
next += temp;
do {
temp = scnprintf (next, size, " ed%d/%p",
ed->interval, ed);
size -= temp;
next += temp;
for (temp = 0; temp < seen_count; temp++) {
if (seen [temp] == ed)
break;
}
/* show more info the first time around */
if (temp == seen_count) {
u32 info = hc32_to_cpu (ohci, ed->hwINFO);
struct list_head *entry;
unsigned qlen = 0;
/* qlen measured here in TDs, not urbs */
list_for_each (entry, &ed->td_list)
qlen++;
temp = scnprintf (next, size,
" (%cs dev%d ep%d%s-%s qlen %u"
" max %d %08x%s%s)",
(info & ED_LOWSPEED) ? 'l' : 'f',
info & 0x7f,
(info >> 7) & 0xf,
(info & ED_IN) ? "in" : "out",
(info & ED_ISO) ? "iso" : "int",
qlen,
0x03ff & (info >> 16),
info,
(info & ED_SKIP) ? " K" : "",
(ed->hwHeadP &
cpu_to_hc32(ohci, ED_H)) ?
" H" : "");
size -= temp;
next += temp;
if (seen_count < DBG_SCHED_LIMIT)
seen [seen_count++] = ed;
ed = ed->ed_next;
} else {
/* we've seen it and what's after */
temp = 0;
ed = NULL;
}
} while (ed);
temp = scnprintf (next, size, "\n");
size -= temp;
next += temp;
}
spin_unlock_irqrestore (&ohci->lock, flags);
kfree (seen);
return PAGE_SIZE - size;
}
#undef DBG_SCHED_LIMIT
static ssize_t fill_registers_buffer(struct debug_buffer *buf)
{
struct usb_bus *bus;
struct usb_hcd *hcd;
struct ohci_hcd *ohci;
struct ohci_regs __iomem *regs;
unsigned long flags;
unsigned temp, size;
char *next;
u32 rdata;
bus = (struct usb_bus *)dev_get_drvdata(buf->dev);
hcd = bus_to_hcd(bus);
ohci = hcd_to_ohci(hcd);
regs = ohci->regs;
next = buf->page;
size = PAGE_SIZE;
spin_lock_irqsave (&ohci->lock, flags);
/* dump driver info, then registers in spec order */
ohci_dbg_sw (ohci, &next, &size,
"bus %s, device %s\n"
"%s\n"
"%s version " DRIVER_VERSION "\n",
hcd->self.controller->bus->name,
dev_name(hcd->self.controller),
hcd->product_desc,
hcd_name);
if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
size -= scnprintf (next, size,
"SUSPENDED (no register access)\n");
goto done;
}
ohci_dump_status(ohci, &next, &size);
/* hcca */
if (ohci->hcca)
ohci_dbg_sw (ohci, &next, &size,
"hcca frame 0x%04x\n", ohci_frame_no(ohci));
/* other registers mostly affect frame timings */
rdata = ohci_readl (ohci, &regs->fminterval);
temp = scnprintf (next, size,
"fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
rdata, (rdata >> 31) ? "FIT " : "",
(rdata >> 16) & 0xefff, rdata & 0xffff);
size -= temp;
next += temp;
rdata = ohci_readl (ohci, &regs->fmremaining);
temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
rdata, (rdata >> 31) ? "FRT " : "",
rdata & 0x3fff);
size -= temp;
next += temp;
rdata = ohci_readl (ohci, &regs->periodicstart);
temp = scnprintf (next, size, "periodicstart 0x%04x\n",
rdata & 0x3fff);
size -= temp;
next += temp;
rdata = ohci_readl (ohci, &regs->lsthresh);
temp = scnprintf (next, size, "lsthresh 0x%04x\n",
rdata & 0x3fff);
size -= temp;
next += temp;
temp = scnprintf (next, size, "hub poll timer %s\n",
ohci_to_hcd(ohci)->poll_rh ? "ON" : "off");
size -= temp;
next += temp;
/* roothub */
ohci_dump_roothub (ohci, 1, &next, &size);
done:
spin_unlock_irqrestore (&ohci->lock, flags);
return PAGE_SIZE - size;
}
static struct debug_buffer *alloc_buffer(struct device *dev,
ssize_t (*fill_func)(struct debug_buffer *))
{
struct debug_buffer *buf;
buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
if (buf) {
buf->dev = dev;
buf->fill_func = fill_func;
mutex_init(&buf->mutex);
}
return buf;
}
static int fill_buffer(struct debug_buffer *buf)
{
int ret = 0;
if (!buf->page)
buf->page = (char *)get_zeroed_page(GFP_KERNEL);
if (!buf->page) {
ret = -ENOMEM;
goto out;
}
ret = buf->fill_func(buf);
if (ret >= 0) {
buf->count = ret;
ret = 0;
}
out:
return ret;
}
static ssize_t debug_output(struct file *file, char __user *user_buf,
size_t len, loff_t *offset)
{
struct debug_buffer *buf = file->private_data;
int ret = 0;
mutex_lock(&buf->mutex);
if (buf->count == 0) {
ret = fill_buffer(buf);
if (ret != 0) {
mutex_unlock(&buf->mutex);
goto out;
}
}
mutex_unlock(&buf->mutex);
ret = simple_read_from_buffer(user_buf, len, offset,
buf->page, buf->count);
out:
return ret;
}
static int debug_close(struct inode *inode, struct file *file)
{
struct debug_buffer *buf = file->private_data;
if (buf) {
if (buf->page)
free_page((unsigned long)buf->page);
kfree(buf);
}
return 0;
}
static int debug_async_open(struct inode *inode, struct file *file)
{
file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
return file->private_data ? 0 : -ENOMEM;
}
static int debug_periodic_open(struct inode *inode, struct file *file)
{
file->private_data = alloc_buffer(inode->i_private,
fill_periodic_buffer);
return file->private_data ? 0 : -ENOMEM;
}
static int debug_registers_open(struct inode *inode, struct file *file)
{
file->private_data = alloc_buffer(inode->i_private,
fill_registers_buffer);
return file->private_data ? 0 : -ENOMEM;
}
static inline void create_debug_files (struct ohci_hcd *ohci)
{
struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
struct device *dev = bus->dev;
ohci->debug_dir = debugfs_create_dir(bus->bus_name, ohci_debug_root);
if (!ohci->debug_dir)
goto dir_error;
ohci->debug_async = debugfs_create_file("async", S_IRUGO,
ohci->debug_dir, dev,
&debug_async_fops);
if (!ohci->debug_async)
goto async_error;
ohci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
ohci->debug_dir, dev,
&debug_periodic_fops);
if (!ohci->debug_periodic)
goto periodic_error;
ohci->debug_registers = debugfs_create_file("registers", S_IRUGO,
ohci->debug_dir, dev,
&debug_registers_fops);
if (!ohci->debug_registers)
goto registers_error;
ohci_dbg (ohci, "created debug files\n");
return;
registers_error:
debugfs_remove(ohci->debug_periodic);
periodic_error:
debugfs_remove(ohci->debug_async);
async_error:
debugfs_remove(ohci->debug_dir);
dir_error:
ohci->debug_periodic = NULL;
ohci->debug_async = NULL;
ohci->debug_dir = NULL;
}
static inline void remove_debug_files (struct ohci_hcd *ohci)
{
debugfs_remove(ohci->debug_registers);
debugfs_remove(ohci->debug_periodic);
debugfs_remove(ohci->debug_async);
debugfs_remove(ohci->debug_dir);
}
#endif
/*-------------------------------------------------------------------------*/
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