786 lines
19 KiB
C
786 lines
19 KiB
C
// SPDX-License-Identifier: GPL-1.0+
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/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
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* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
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*
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* This file is licenced under the GPL.
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*/
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/*-------------------------------------------------------------------------*/
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#define edstring(ed_type) ({ char *temp; \
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switch (ed_type) { \
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case PIPE_CONTROL: temp = "ctrl"; break; \
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case PIPE_BULK: temp = "bulk"; break; \
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case PIPE_INTERRUPT: temp = "intr"; break; \
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default: temp = "isoc"; break; \
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} temp;})
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#define pipestring(pipe) edstring(usb_pipetype(pipe))
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#define ohci_dbg_sw(ohci, next, size, format, arg...) \
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do { \
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if (next != NULL) { \
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unsigned s_len; \
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s_len = scnprintf (*next, *size, format, ## arg ); \
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*size -= s_len; *next += s_len; \
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} else \
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ohci_dbg(ohci,format, ## arg ); \
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} while (0);
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/* Version for use where "next" is the address of a local variable */
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#define ohci_dbg_nosw(ohci, next, size, format, arg...) \
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do { \
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unsigned s_len; \
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s_len = scnprintf(*next, *size, format, ## arg); \
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*size -= s_len; *next += s_len; \
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} while (0);
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static void ohci_dump_intr_mask (
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struct ohci_hcd *ohci,
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char *label,
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u32 mask,
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char **next,
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unsigned *size)
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{
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ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
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label,
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mask,
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(mask & OHCI_INTR_MIE) ? " MIE" : "",
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(mask & OHCI_INTR_OC) ? " OC" : "",
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(mask & OHCI_INTR_RHSC) ? " RHSC" : "",
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(mask & OHCI_INTR_FNO) ? " FNO" : "",
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(mask & OHCI_INTR_UE) ? " UE" : "",
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(mask & OHCI_INTR_RD) ? " RD" : "",
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(mask & OHCI_INTR_SF) ? " SF" : "",
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(mask & OHCI_INTR_WDH) ? " WDH" : "",
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(mask & OHCI_INTR_SO) ? " SO" : ""
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);
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}
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static void maybe_print_eds (
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struct ohci_hcd *ohci,
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char *label,
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u32 value,
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char **next,
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unsigned *size)
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{
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if (value)
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ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
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}
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static char *hcfs2string (int state)
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{
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switch (state) {
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case OHCI_USB_RESET: return "reset";
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case OHCI_USB_RESUME: return "resume";
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case OHCI_USB_OPER: return "operational";
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case OHCI_USB_SUSPEND: return "suspend";
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}
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return "?";
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}
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static const char *rh_state_string(struct ohci_hcd *ohci)
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{
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switch (ohci->rh_state) {
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case OHCI_RH_HALTED:
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return "halted";
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case OHCI_RH_SUSPENDED:
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return "suspended";
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case OHCI_RH_RUNNING:
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return "running";
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}
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return "?";
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}
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// dump control and status registers
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static void
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ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
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{
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struct ohci_regs __iomem *regs = controller->regs;
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u32 temp;
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temp = ohci_readl (controller, ®s->revision) & 0xff;
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ohci_dbg_sw (controller, next, size,
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"OHCI %d.%d, %s legacy support registers, rh state %s\n",
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0x03 & (temp >> 4), (temp & 0x0f),
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(temp & 0x0100) ? "with" : "NO",
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rh_state_string(controller));
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temp = ohci_readl (controller, ®s->control);
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ohci_dbg_sw (controller, next, size,
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"control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
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temp,
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(temp & OHCI_CTRL_RWE) ? " RWE" : "",
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(temp & OHCI_CTRL_RWC) ? " RWC" : "",
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(temp & OHCI_CTRL_IR) ? " IR" : "",
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hcfs2string (temp & OHCI_CTRL_HCFS),
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(temp & OHCI_CTRL_BLE) ? " BLE" : "",
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(temp & OHCI_CTRL_CLE) ? " CLE" : "",
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(temp & OHCI_CTRL_IE) ? " IE" : "",
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(temp & OHCI_CTRL_PLE) ? " PLE" : "",
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temp & OHCI_CTRL_CBSR
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);
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temp = ohci_readl (controller, ®s->cmdstatus);
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ohci_dbg_sw (controller, next, size,
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"cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
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(temp & OHCI_SOC) >> 16,
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(temp & OHCI_OCR) ? " OCR" : "",
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(temp & OHCI_BLF) ? " BLF" : "",
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(temp & OHCI_CLF) ? " CLF" : "",
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(temp & OHCI_HCR) ? " HCR" : ""
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);
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ohci_dump_intr_mask (controller, "intrstatus",
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ohci_readl (controller, ®s->intrstatus),
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next, size);
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ohci_dump_intr_mask (controller, "intrenable",
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ohci_readl (controller, ®s->intrenable),
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next, size);
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// intrdisable always same as intrenable
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maybe_print_eds (controller, "ed_periodcurrent",
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ohci_readl (controller, ®s->ed_periodcurrent),
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next, size);
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maybe_print_eds (controller, "ed_controlhead",
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ohci_readl (controller, ®s->ed_controlhead),
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next, size);
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maybe_print_eds (controller, "ed_controlcurrent",
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ohci_readl (controller, ®s->ed_controlcurrent),
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next, size);
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maybe_print_eds (controller, "ed_bulkhead",
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ohci_readl (controller, ®s->ed_bulkhead),
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next, size);
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maybe_print_eds (controller, "ed_bulkcurrent",
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ohci_readl (controller, ®s->ed_bulkcurrent),
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next, size);
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maybe_print_eds (controller, "donehead",
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ohci_readl (controller, ®s->donehead), next, size);
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}
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#define dbg_port_sw(hc,num,value,next,size) \
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ohci_dbg_sw (hc, next, size, \
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"roothub.portstatus [%d] " \
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"0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
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num, temp, \
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(temp & RH_PS_PRSC) ? " PRSC" : "", \
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(temp & RH_PS_OCIC) ? " OCIC" : "", \
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(temp & RH_PS_PSSC) ? " PSSC" : "", \
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(temp & RH_PS_PESC) ? " PESC" : "", \
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(temp & RH_PS_CSC) ? " CSC" : "", \
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\
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(temp & RH_PS_LSDA) ? " LSDA" : "", \
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(temp & RH_PS_PPS) ? " PPS" : "", \
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(temp & RH_PS_PRS) ? " PRS" : "", \
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(temp & RH_PS_POCI) ? " POCI" : "", \
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(temp & RH_PS_PSS) ? " PSS" : "", \
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\
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(temp & RH_PS_PES) ? " PES" : "", \
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(temp & RH_PS_CCS) ? " CCS" : "" \
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);
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static void
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ohci_dump_roothub (
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struct ohci_hcd *controller,
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int verbose,
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char **next,
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unsigned *size)
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{
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u32 temp, i;
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temp = roothub_a (controller);
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if (temp == ~(u32)0)
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return;
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if (verbose) {
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ohci_dbg_sw (controller, next, size,
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"roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp,
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((temp & RH_A_POTPGT) >> 24) & 0xff,
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(temp & RH_A_NOCP) ? " NOCP" : "",
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(temp & RH_A_OCPM) ? " OCPM" : "",
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(temp & RH_A_DT) ? " DT" : "",
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(temp & RH_A_NPS) ? " NPS" : "",
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(temp & RH_A_PSM) ? " PSM" : "",
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(temp & RH_A_NDP), controller->num_ports
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);
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temp = roothub_b (controller);
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ohci_dbg_sw (controller, next, size,
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"roothub.b %08x PPCM=%04x DR=%04x\n",
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temp,
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(temp & RH_B_PPCM) >> 16,
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(temp & RH_B_DR)
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);
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temp = roothub_status (controller);
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ohci_dbg_sw (controller, next, size,
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"roothub.status %08x%s%s%s%s%s%s\n",
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temp,
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(temp & RH_HS_CRWE) ? " CRWE" : "",
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(temp & RH_HS_OCIC) ? " OCIC" : "",
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(temp & RH_HS_LPSC) ? " LPSC" : "",
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(temp & RH_HS_DRWE) ? " DRWE" : "",
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(temp & RH_HS_OCI) ? " OCI" : "",
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(temp & RH_HS_LPS) ? " LPS" : ""
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);
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}
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for (i = 0; i < controller->num_ports; i++) {
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temp = roothub_portstatus (controller, i);
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dbg_port_sw (controller, i, temp, next, size);
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}
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}
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static void ohci_dump(struct ohci_hcd *controller)
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{
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ohci_dbg (controller, "OHCI controller state\n");
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// dumps some of the state we know about
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ohci_dump_status (controller, NULL, NULL);
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if (controller->hcca)
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ohci_dbg (controller,
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"hcca frame #%04x\n", ohci_frame_no(controller));
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ohci_dump_roothub (controller, 1, NULL, NULL);
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}
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static const char data0 [] = "DATA0";
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static const char data1 [] = "DATA1";
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static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
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const struct td *td)
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{
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u32 tmp = hc32_to_cpup (ohci, &td->hwINFO);
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ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
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label, td,
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(tmp & TD_DONE) ? " (DONE)" : "",
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td->urb, td->index,
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hc32_to_cpup (ohci, &td->hwNextTD));
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if ((tmp & TD_ISO) == 0) {
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const char *toggle, *pid;
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u32 cbp, be;
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switch (tmp & TD_T) {
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case TD_T_DATA0: toggle = data0; break;
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case TD_T_DATA1: toggle = data1; break;
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case TD_T_TOGGLE: toggle = "(CARRY)"; break;
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default: toggle = "(?)"; break;
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}
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switch (tmp & TD_DP) {
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case TD_DP_SETUP: pid = "SETUP"; break;
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case TD_DP_IN: pid = "IN"; break;
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case TD_DP_OUT: pid = "OUT"; break;
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default: pid = "(bad pid)"; break;
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}
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ohci_dbg (ohci, " info %08x CC=%x %s DI=%d %s %s\n", tmp,
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TD_CC_GET(tmp), /* EC, */ toggle,
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(tmp & TD_DI) >> 21, pid,
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(tmp & TD_R) ? "R" : "");
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cbp = hc32_to_cpup (ohci, &td->hwCBP);
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be = hc32_to_cpup (ohci, &td->hwBE);
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ohci_dbg (ohci, " cbp %08x be %08x (len %d)\n", cbp, be,
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cbp ? (be + 1 - cbp) : 0);
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} else {
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unsigned i;
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ohci_dbg (ohci, " info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
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TD_CC_GET(tmp),
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(tmp >> 24) & 0x07,
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(tmp & TD_DI) >> 21,
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tmp & 0x0000ffff);
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ohci_dbg (ohci, " bp0 %08x be %08x\n",
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hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
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hc32_to_cpup (ohci, &td->hwBE));
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for (i = 0; i < MAXPSW; i++) {
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u16 psw = ohci_hwPSW (ohci, td, i);
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int cc = (psw >> 12) & 0x0f;
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ohci_dbg (ohci, " psw [%d] = %2x, CC=%x %s=%d\n", i,
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psw, cc,
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(cc >= 0x0e) ? "OFFSET" : "SIZE",
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psw & 0x0fff);
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}
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}
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}
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/* caller MUST own hcd spinlock if verbose is set! */
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static void __maybe_unused
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ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
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const struct ed *ed, int verbose)
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{
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u32 tmp = hc32_to_cpu (ohci, ed->hwINFO);
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char *type = "";
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ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
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label,
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ed, ed->state, edstring (ed->type),
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hc32_to_cpup (ohci, &ed->hwNextED));
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switch (tmp & (ED_IN|ED_OUT)) {
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case ED_OUT: type = "-OUT"; break;
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case ED_IN: type = "-IN"; break;
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/* else from TDs ... control */
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}
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ohci_dbg (ohci,
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" info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
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0x03ff & (tmp >> 16),
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(tmp & ED_DEQUEUE) ? " DQ" : "",
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(tmp & ED_ISO) ? " ISO" : "",
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(tmp & ED_SKIP) ? " SKIP" : "",
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(tmp & ED_LOWSPEED) ? " LOW" : "",
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0x000f & (tmp >> 7),
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type,
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0x007f & tmp);
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tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
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ohci_dbg (ohci, " tds: head %08x %s%s tail %08x%s\n",
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tmp,
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(tmp & ED_C) ? data1 : data0,
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(tmp & ED_H) ? " HALT" : "",
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hc32_to_cpup (ohci, &ed->hwTailP),
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verbose ? "" : " (not listing)");
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if (verbose) {
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struct list_head *tmp;
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/* use ed->td_list because HC concurrently modifies
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* hwNextTD as it accumulates ed_donelist.
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*/
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list_for_each (tmp, &ed->td_list) {
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struct td *td;
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td = list_entry (tmp, struct td, td_list);
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ohci_dump_td (ohci, " ->", td);
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}
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}
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}
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/*-------------------------------------------------------------------------*/
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static int debug_async_open(struct inode *, struct file *);
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static int debug_periodic_open(struct inode *, struct file *);
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static int debug_registers_open(struct inode *, struct file *);
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static int debug_async_open(struct inode *, struct file *);
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static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
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static int debug_close(struct inode *, struct file *);
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static const struct file_operations debug_async_fops = {
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.owner = THIS_MODULE,
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.open = debug_async_open,
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.read = debug_output,
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.release = debug_close,
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.llseek = default_llseek,
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};
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static const struct file_operations debug_periodic_fops = {
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.owner = THIS_MODULE,
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.open = debug_periodic_open,
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.read = debug_output,
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.release = debug_close,
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.llseek = default_llseek,
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};
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static const struct file_operations debug_registers_fops = {
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.owner = THIS_MODULE,
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.open = debug_registers_open,
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.read = debug_output,
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.release = debug_close,
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.llseek = default_llseek,
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};
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static struct dentry *ohci_debug_root;
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struct debug_buffer {
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ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
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struct ohci_hcd *ohci;
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struct mutex mutex; /* protect filling of buffer */
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size_t count; /* number of characters filled into buffer */
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char *page;
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};
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static ssize_t
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show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
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{
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unsigned temp, size = count;
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if (!ed)
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return 0;
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/* print first --> last */
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while (ed->ed_prev)
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ed = ed->ed_prev;
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/* dump a snapshot of the bulk or control schedule */
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while (ed) {
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u32 info = hc32_to_cpu (ohci, ed->hwINFO);
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u32 headp = hc32_to_cpu (ohci, ed->hwHeadP);
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struct list_head *entry;
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struct td *td;
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temp = scnprintf (buf, size,
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"ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
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ed,
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(info & ED_LOWSPEED) ? 'l' : 'f',
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info & 0x7f,
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(info >> 7) & 0xf,
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(info & ED_IN) ? "in" : "out",
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0x03ff & (info >> 16),
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info,
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(info & ED_SKIP) ? " s" : "",
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(headp & ED_H) ? " H" : "",
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(headp & ED_C) ? data1 : data0);
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size -= temp;
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buf += temp;
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list_for_each (entry, &ed->td_list) {
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u32 cbp, be;
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td = list_entry (entry, struct td, td_list);
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info = hc32_to_cpup (ohci, &td->hwINFO);
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cbp = hc32_to_cpup (ohci, &td->hwCBP);
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be = hc32_to_cpup (ohci, &td->hwBE);
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temp = scnprintf (buf, size,
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"\n\ttd %p %s %d cc=%x urb %p (%08x)",
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td,
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({ char *pid;
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switch (info & TD_DP) {
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case TD_DP_SETUP: pid = "setup"; break;
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case TD_DP_IN: pid = "in"; break;
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case TD_DP_OUT: pid = "out"; break;
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default: pid = "(?)"; break;
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} pid;}),
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cbp ? (be + 1 - cbp) : 0,
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TD_CC_GET (info), td->urb, info);
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size -= temp;
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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 ohci_hcd *ohci;
|
|
size_t temp, size;
|
|
unsigned long flags;
|
|
|
|
ohci = buf->ohci;
|
|
size = PAGE_SIZE;
|
|
|
|
/* display control and bulk lists together, for simplicity */
|
|
spin_lock_irqsave (&ohci->lock, flags);
|
|
temp = show_list(ohci, buf->page, size, ohci->ed_controltail);
|
|
temp += show_list(ohci, buf->page + temp, size - 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 ohci_hcd *ohci;
|
|
struct ed **seen, *ed;
|
|
unsigned long flags;
|
|
unsigned temp, size, seen_count;
|
|
char *next;
|
|
unsigned i;
|
|
|
|
seen = kmalloc_array(DBG_SCHED_LIMIT, sizeof(*seen), GFP_ATOMIC);
|
|
if (!seen)
|
|
return 0;
|
|
seen_count = 0;
|
|
|
|
ohci = buf->ohci;
|
|
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++) {
|
|
ed = ohci->periodic[i];
|
|
if (!ed)
|
|
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_hcd *hcd;
|
|
struct ohci_hcd *ohci;
|
|
struct ohci_regs __iomem *regs;
|
|
unsigned long flags;
|
|
unsigned temp, size;
|
|
char *next;
|
|
u32 rdata;
|
|
|
|
ohci = buf->ohci;
|
|
hcd = ohci_to_hcd(ohci);
|
|
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_nosw(ohci, &next, &size,
|
|
"bus %s, device %s\n"
|
|
"%s\n"
|
|
"%s\n",
|
|
hcd->self.controller->bus->name,
|
|
dev_name(hcd->self.controller),
|
|
hcd->product_desc,
|
|
hcd_name);
|
|
|
|
if (!HCD_HW_ACCESSIBLE(hcd)) {
|
|
size -= scnprintf (next, size,
|
|
"SUSPENDED (no register access)\n");
|
|
goto done;
|
|
}
|
|
|
|
ohci_dump_status(ohci, &next, &size);
|
|
|
|
/* hcca */
|
|
if (ohci->hcca)
|
|
ohci_dbg_nosw(ohci, &next, &size,
|
|
"hcca frame 0x%04x\n", ohci_frame_no(ohci));
|
|
|
|
/* other registers mostly affect frame timings */
|
|
rdata = ohci_readl (ohci, ®s->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, ®s->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, ®s->periodicstart);
|
|
temp = scnprintf (next, size, "periodicstart 0x%04x\n",
|
|
rdata & 0x3fff);
|
|
size -= temp;
|
|
next += temp;
|
|
|
|
rdata = ohci_readl (ohci, ®s->lsthresh);
|
|
temp = scnprintf (next, size, "lsthresh 0x%04x\n",
|
|
rdata & 0x3fff);
|
|
size -= temp;
|
|
next += temp;
|
|
|
|
temp = scnprintf (next, size, "hub poll timer %s\n",
|
|
HCD_POLL_RH(ohci_to_hcd(ohci)) ? "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 ohci_hcd *ohci,
|
|
ssize_t (*fill_func)(struct debug_buffer *))
|
|
{
|
|
struct debug_buffer *buf;
|
|
|
|
buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
|
|
|
|
if (buf) {
|
|
buf->ohci = ohci;
|
|
buf->fill_func = fill_func;
|
|
mutex_init(&buf->mutex);
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static int fill_buffer(struct debug_buffer *buf)
|
|
{
|
|
int ret;
|
|
|
|
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;
|
|
|
|
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 dentry *root;
|
|
|
|
root = debugfs_create_dir(bus->bus_name, ohci_debug_root);
|
|
ohci->debug_dir = root;
|
|
|
|
debugfs_create_file("async", S_IRUGO, root, ohci, &debug_async_fops);
|
|
debugfs_create_file("periodic", S_IRUGO, root, ohci,
|
|
&debug_periodic_fops);
|
|
debugfs_create_file("registers", S_IRUGO, root, ohci,
|
|
&debug_registers_fops);
|
|
|
|
ohci_dbg (ohci, "created debug files\n");
|
|
}
|
|
|
|
static inline void remove_debug_files (struct ohci_hcd *ohci)
|
|
{
|
|
debugfs_remove_recursive(ohci->debug_dir);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|