HID: Never call hid_free_buffers() when usbhid_device has been freed

[linux-2.6/zen-sources.git] / drivers / hid / usbhid / hid-core.c

/*
 *  USB HID support for Linux
 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
 *  Copyright (c) 2006-2007 Jiri Kosina
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>
#include <linux/input.h>
#include <linux/wait.h>

#include <linux/usb.h>

#include <linux/hid.h>
#include <linux/hiddev.h>
#include <linux/hid-debug.h>
#include "usbhid.h"

/*
 * Version Information
 */

#define DRIVER_VERSION "v2.6"
#define DRIVER_AUTHOR "Andreas Gal, Vojtech Pavlik, Jiri Kosina"
#define DRIVER_DESC "USB HID core driver"
#define DRIVER_LICENSE "GPL"

static char *hid_types[] = {"Device", "Pointer", "Mouse", "Device", "Joystick",
                                "Gamepad", "Keyboard", "Keypad", "Multi-Axis Controller"};
/*
 * Module parameters.
 */

static unsigned int hid_mousepoll_interval;
module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
MODULE_PARM_DESC(mousepoll, "Polling interval of mice");

/* Quirks specified at module load time */
static char *quirks_param[MAX_USBHID_BOOT_QUIRKS] = { [ 0 ... (MAX_USBHID_BOOT_QUIRKS - 1) ] = NULL };
module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
                " quirks=vendorID:productID:quirks"
                " where vendorID, productID, and quirks are all in"
                " 0x-prefixed hex");
static char *rdesc_quirks_param[MAX_USBHID_BOOT_QUIRKS] = { [ 0 ... (MAX_USBHID_BOOT_QUIRKS - 1) ] = NULL };
module_param_array_named(rdesc_quirks, rdesc_quirks_param, charp, NULL, 0444);
MODULE_PARM_DESC(rdesc_quirks, "Add/modify report descriptor quirks by specifying "
                " rdesc_quirks=vendorID:productID:rdesc_quirks"
                " where vendorID, productID, and rdesc_quirks are all in"
                " 0x-prefixed hex");
/*
 * Input submission and I/O error handler.
 */

static void hid_io_error(struct hid_device *hid);

/* Start up the input URB */
static int hid_start_in(struct hid_device *hid)
{
        unsigned long flags;
        int rc = 0;
        struct usbhid_device *usbhid = hid->driver_data;

        spin_lock_irqsave(&usbhid->inlock, flags);
        if (hid->open > 0 && !test_bit(HID_SUSPENDED, &usbhid->iofl) &&
                        !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
                rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
                if (rc != 0)
                        clear_bit(HID_IN_RUNNING, &usbhid->iofl);
        }
        spin_unlock_irqrestore(&usbhid->inlock, flags);
        return rc;
}

/* I/O retry timer routine */
static void hid_retry_timeout(unsigned long _hid)
{
        struct hid_device *hid = (struct hid_device *) _hid;
        struct usbhid_device *usbhid = hid->driver_data;

        dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
        if (hid_start_in(hid))
                hid_io_error(hid);
}

/* Workqueue routine to reset the device or clear a halt */
static void hid_reset(struct work_struct *work)
{
        struct usbhid_device *usbhid =
                container_of(work, struct usbhid_device, reset_work);
        struct hid_device *hid = usbhid->hid;
        int rc_lock, rc = 0;

        if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
                dev_dbg(&usbhid->intf->dev, "clear halt\n");
                rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
                clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
                hid_start_in(hid);
        }

        else if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
                dev_dbg(&usbhid->intf->dev, "resetting device\n");
                rc = rc_lock = usb_lock_device_for_reset(hid_to_usb_dev(hid), usbhid->intf);
                if (rc_lock >= 0) {
                        rc = usb_reset_composite_device(hid_to_usb_dev(hid), usbhid->intf);
                        if (rc_lock)
                                usb_unlock_device(hid_to_usb_dev(hid));
                }
                clear_bit(HID_RESET_PENDING, &usbhid->iofl);
        }

        switch (rc) {
        case 0:
                if (!test_bit(HID_IN_RUNNING, &usbhid->iofl))
                        hid_io_error(hid);
                break;
        default:
                err_hid("can't reset device, %s-%s/input%d, status %d",
                                hid_to_usb_dev(hid)->bus->bus_name,
                                hid_to_usb_dev(hid)->devpath,
                                usbhid->ifnum, rc);
                /* FALLTHROUGH */
        case -EHOSTUNREACH:
        case -ENODEV:
        case -EINTR:
                break;
        }
}

/* Main I/O error handler */
static void hid_io_error(struct hid_device *hid)
{
        unsigned long flags;
        struct usbhid_device *usbhid = hid->driver_data;

        spin_lock_irqsave(&usbhid->inlock, flags);

        /* Stop when disconnected */
        if (usb_get_intfdata(usbhid->intf) == NULL)
                goto done;

        /* If it has been a while since the last error, we'll assume
         * this a brand new error and reset the retry timeout. */
        if (time_after(jiffies, usbhid->stop_retry + HZ/2))
                usbhid->retry_delay = 0;

        /* When an error occurs, retry at increasing intervals */
        if (usbhid->retry_delay == 0) {
                usbhid->retry_delay = 13;       /* Then 26, 52, 104, 104, ... */
                usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
        } else if (usbhid->retry_delay < 100)
                usbhid->retry_delay *= 2;

        if (time_after(jiffies, usbhid->stop_retry)) {

                /* Retries failed, so do a port reset */
                if (!test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
                        schedule_work(&usbhid->reset_work);
                        goto done;
                }
        }

        mod_timer(&usbhid->io_retry,
                        jiffies + msecs_to_jiffies(usbhid->retry_delay));
done:
        spin_unlock_irqrestore(&usbhid->inlock, flags);
}

/*
 * Input interrupt completion handler.
 */

static void hid_irq_in(struct urb *urb)
{
        struct hid_device       *hid = urb->context;
        struct usbhid_device    *usbhid = hid->driver_data;
        int                     status;

        switch (urb->status) {
                case 0:                 /* success */
                        usbhid->retry_delay = 0;
                        hid_input_report(urb->context, HID_INPUT_REPORT,
                                         urb->transfer_buffer,
                                         urb->actual_length, 1);
                        break;
                case -EPIPE:            /* stall */
                        clear_bit(HID_IN_RUNNING, &usbhid->iofl);
                        set_bit(HID_CLEAR_HALT, &usbhid->iofl);
                        schedule_work(&usbhid->reset_work);
                        return;
                case -ECONNRESET:       /* unlink */
                case -ENOENT:
                case -ESHUTDOWN:        /* unplug */
                        clear_bit(HID_IN_RUNNING, &usbhid->iofl);
                        return;
                case -EILSEQ:           /* protocol error or unplug */
                case -EPROTO:           /* protocol error or unplug */
                case -ETIME:            /* protocol error or unplug */
                case -ETIMEDOUT:        /* Should never happen, but... */
                        clear_bit(HID_IN_RUNNING, &usbhid->iofl);
                        hid_io_error(hid);
                        return;
                default:                /* error */
                        warn("input irq status %d received", urb->status);
        }

        status = usb_submit_urb(urb, GFP_ATOMIC);
        if (status) {
                clear_bit(HID_IN_RUNNING, &usbhid->iofl);
                if (status != -EPERM) {
                        err_hid("can't resubmit intr, %s-%s/input%d, status %d",
                                        hid_to_usb_dev(hid)->bus->bus_name,
                                        hid_to_usb_dev(hid)->devpath,
                                        usbhid->ifnum, status);
                        hid_io_error(hid);
                }
        }
}

static int hid_submit_out(struct hid_device *hid)
{
        struct hid_report *report;
        struct usbhid_device *usbhid = hid->driver_data;

        report = usbhid->out[usbhid->outtail];

        hid_output_report(report, usbhid->outbuf);
        usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) + 1 + (report->id > 0);
        usbhid->urbout->dev = hid_to_usb_dev(hid);

        dbg_hid("submitting out urb\n");

        if (usb_submit_urb(usbhid->urbout, GFP_ATOMIC)) {
                err_hid("usb_submit_urb(out) failed");
                return -1;
        }

        return 0;
}

static int hid_submit_ctrl(struct hid_device *hid)
{
        struct hid_report *report;
        unsigned char dir;
        int len;
        struct usbhid_device *usbhid = hid->driver_data;

        report = usbhid->ctrl[usbhid->ctrltail].report;
        dir = usbhid->ctrl[usbhid->ctrltail].dir;

        len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
        if (dir == USB_DIR_OUT) {
                hid_output_report(report, usbhid->ctrlbuf);
                usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
                usbhid->urbctrl->transfer_buffer_length = len;
        } else {
                int maxpacket, padlen;

                usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
                maxpacket = usb_maxpacket(hid_to_usb_dev(hid), usbhid->urbctrl->pipe, 0);
                if (maxpacket > 0) {
                        padlen = (len + maxpacket - 1) / maxpacket;
                        padlen *= maxpacket;
                        if (padlen > usbhid->bufsize)
                                padlen = usbhid->bufsize;
                } else
                        padlen = 0;
                usbhid->urbctrl->transfer_buffer_length = padlen;
        }
        usbhid->urbctrl->dev = hid_to_usb_dev(hid);

        usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
        usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT : HID_REQ_GET_REPORT;
        usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) | report->id);
        usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
        usbhid->cr->wLength = cpu_to_le16(len);

        dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
                usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" : "Get_Report",
                usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);

        if (usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC)) {
                err_hid("usb_submit_urb(ctrl) failed");
                return -1;
        }

        return 0;
}

/*
 * Output interrupt completion handler.
 */

static void hid_irq_out(struct urb *urb)
{
        struct hid_device *hid = urb->context;
        struct usbhid_device *usbhid = hid->driver_data;
        unsigned long flags;
        int unplug = 0;

        switch (urb->status) {
                case 0:                 /* success */
                        break;
                case -ESHUTDOWN:        /* unplug */
                        unplug = 1;
                case -EILSEQ:           /* protocol error or unplug */
                case -EPROTO:           /* protocol error or unplug */
                case -ECONNRESET:       /* unlink */
                case -ENOENT:
                        break;
                default:                /* error */
                        warn("output irq status %d received", urb->status);
        }

        spin_lock_irqsave(&usbhid->outlock, flags);

        if (unplug)
                usbhid->outtail = usbhid->outhead;
        else
                usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);

        if (usbhid->outhead != usbhid->outtail) {
                if (hid_submit_out(hid)) {
                        clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
                        wake_up(&hid->wait);
                }
                spin_unlock_irqrestore(&usbhid->outlock, flags);
                return;
        }

        clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
        spin_unlock_irqrestore(&usbhid->outlock, flags);
        wake_up(&hid->wait);
}

/*
 * Control pipe completion handler.
 */

static void hid_ctrl(struct urb *urb)
{
        struct hid_device *hid = urb->context;
        struct usbhid_device *usbhid = hid->driver_data;
        unsigned long flags;
        int unplug = 0;

        spin_lock_irqsave(&usbhid->ctrllock, flags);

        switch (urb->status) {
                case 0:                 /* success */
                        if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
                                hid_input_report(urb->context, usbhid->ctrl[usbhid->ctrltail].report->type,
                                                urb->transfer_buffer, urb->actual_length, 0);
                        break;
                case -ESHUTDOWN:        /* unplug */
                        unplug = 1;
                case -EILSEQ:           /* protocol error or unplug */
                case -EPROTO:           /* protocol error or unplug */
                case -ECONNRESET:       /* unlink */
                case -ENOENT:
                case -EPIPE:            /* report not available */
                        break;
                default:                /* error */
                        warn("ctrl urb status %d received", urb->status);
        }

        if (unplug)
                usbhid->ctrltail = usbhid->ctrlhead;
        else
                usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);

        if (usbhid->ctrlhead != usbhid->ctrltail) {
                if (hid_submit_ctrl(hid)) {
                        clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
                        wake_up(&hid->wait);
                }
                spin_unlock_irqrestore(&usbhid->ctrllock, flags);
                return;
        }

        clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
        spin_unlock_irqrestore(&usbhid->ctrllock, flags);
        wake_up(&hid->wait);
}

void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
{
        int head;
        unsigned long flags;
        struct usbhid_device *usbhid = hid->driver_data;

        if ((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN)
                return;

        if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {

                spin_lock_irqsave(&usbhid->outlock, flags);

                if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
                        spin_unlock_irqrestore(&usbhid->outlock, flags);
                        warn("output queue full");
                        return;
                }

                usbhid->out[usbhid->outhead] = report;
                usbhid->outhead = head;

                if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl))
                        if (hid_submit_out(hid))
                                clear_bit(HID_OUT_RUNNING, &usbhid->iofl);

                spin_unlock_irqrestore(&usbhid->outlock, flags);
                return;
        }

        spin_lock_irqsave(&usbhid->ctrllock, flags);

        if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
                spin_unlock_irqrestore(&usbhid->ctrllock, flags);
                warn("control queue full");
                return;
        }

        usbhid->ctrl[usbhid->ctrlhead].report = report;
        usbhid->ctrl[usbhid->ctrlhead].dir = dir;
        usbhid->ctrlhead = head;

        if (!test_and_set_bit(HID_CTRL_RUNNING, &usbhid->iofl))
                if (hid_submit_ctrl(hid))
                        clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);

        spin_unlock_irqrestore(&usbhid->ctrllock, flags);
}

static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
        struct hid_device *hid = input_get_drvdata(dev);
        struct hid_field *field;
        int offset;

        if (type == EV_FF)
                return input_ff_event(dev, type, code, value);

        if (type != EV_LED)
                return -1;

        if ((offset = hidinput_find_field(hid, type, code, &field)) == -1) {
                warn("event field not found");
                return -1;
        }

        hid_set_field(field, offset, value);
        usbhid_submit_report(hid, field->report, USB_DIR_OUT);

        return 0;
}

int usbhid_wait_io(struct hid_device *hid)
{
        struct usbhid_device *usbhid = hid->driver_data;

        if (!wait_event_timeout(hid->wait, (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
                                        !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
                                        10*HZ)) {
                dbg_hid("timeout waiting for ctrl or out queue to clear\n");
                return -1;
        }

        return 0;
}

static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
{
        return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
                HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
                ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
}

static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
                unsigned char type, void *buf, int size)
{
        int result, retries = 4;

        memset(buf, 0, size);

        do {
                result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
                                USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
                                (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
                retries--;
        } while (result < size && retries);
        return result;
}

int usbhid_open(struct hid_device *hid)
{
        ++hid->open;
        if (hid_start_in(hid))
                hid_io_error(hid);
        return 0;
}

void usbhid_close(struct hid_device *hid)
{
        struct usbhid_device *usbhid = hid->driver_data;

        if (!--hid->open)
                usb_kill_urb(usbhid->urbin);
}

/*
 * Initialize all reports
 */

void usbhid_init_reports(struct hid_device *hid)
{
        struct hid_report *report;
        struct usbhid_device *usbhid = hid->driver_data;
        int err, ret;

        list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list)
                usbhid_submit_report(hid, report, USB_DIR_IN);

        list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
                usbhid_submit_report(hid, report, USB_DIR_IN);

        err = 0;
        ret = usbhid_wait_io(hid);
        while (ret) {
                err |= ret;
                if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
                        usb_kill_urb(usbhid->urbctrl);
                if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
                        usb_kill_urb(usbhid->urbout);
                ret = usbhid_wait_io(hid);
        }

        if (err)
                warn("timeout initializing reports");
}

/*
 * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
 */
static int hid_find_field_early(struct hid_device *hid, unsigned int page,
    unsigned int hid_code, struct hid_field **pfield)
{
        struct hid_report *report;
        struct hid_field *field;
        struct hid_usage *usage;
        int i, j;

        list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
                for (i = 0; i < report->maxfield; i++) {
                        field = report->field[i];
                        for (j = 0; j < field->maxusage; j++) {
                                usage = &field->usage[j];
                                if ((usage->hid & HID_USAGE_PAGE) == page &&
                                    (usage->hid & 0xFFFF) == hid_code) {
                                        *pfield = field;
                                        return j;
                                }
                        }
                }
        }
        return -1;
}

static void usbhid_set_leds(struct hid_device *hid)
{
        struct hid_field *field;
        int offset;

        if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
                hid_set_field(field, offset, 0);
                usbhid_submit_report(hid, field->report, USB_DIR_OUT);
        }
}

/*
 * Traverse the supplied list of reports and find the longest
 */
static void hid_find_max_report(struct hid_device *hid, unsigned int type, int *max)
{
        struct hid_report *report;
        int size;

        list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
                size = ((report->size - 1) >> 3) + 1;
                if (type == HID_INPUT_REPORT && hid->report_enum[type].numbered)
                        size++;
                if (*max < size)
                        *max = size;
        }
}

static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
{
        struct usbhid_device *usbhid = hid->driver_data;

        if (!(usbhid->inbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_ATOMIC, &usbhid->inbuf_dma)))
                return -1;
        if (!(usbhid->outbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_ATOMIC, &usbhid->outbuf_dma)))
                return -1;
        if (!(usbhid->cr = usb_buffer_alloc(dev, sizeof(*(usbhid->cr)), GFP_ATOMIC, &usbhid->cr_dma)))
                return -1;
        if (!(usbhid->ctrlbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_ATOMIC, &usbhid->ctrlbuf_dma)))
                return -1;

        return 0;
}

static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
{
        struct usbhid_device *usbhid = hid->driver_data;

        usb_buffer_free(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
        usb_buffer_free(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
        usb_buffer_free(dev, sizeof(*(usbhid->cr)), usbhid->cr, usbhid->cr_dma);
        usb_buffer_free(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
}

/*
 * Sending HID_REQ_GET_REPORT changes the operation mode of the ps3 controller
 * to "operational".  Without this, the ps3 controller will not report any
 * events.
 */
static void hid_fixup_sony_ps3_controller(struct usb_device *dev, int ifnum)
{
        int result;
        char *buf = kmalloc(18, GFP_KERNEL);

        if (!buf)
                return;

        result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
                                 HID_REQ_GET_REPORT,
                                 USB_DIR_IN | USB_TYPE_CLASS |
                                 USB_RECIP_INTERFACE,
                                 (3 << 8) | 0xf2, ifnum, buf, 17,
                                 USB_CTRL_GET_TIMEOUT);

        if (result < 0)
                err_hid("%s failed: %d\n", __func__, result);

        kfree(buf);
}

static struct hid_device *usb_hid_configure(struct usb_interface *intf)
{
        struct usb_host_interface *interface = intf->cur_altsetting;
        struct usb_device *dev = interface_to_usbdev (intf);
        struct hid_descriptor *hdesc;
        struct hid_device *hid;
        u32 quirks = 0;
        unsigned rsize = 0;
        char *rdesc;
        int n, len, insize = 0;
        struct usbhid_device *usbhid;

        quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor),
                        le16_to_cpu(dev->descriptor.idProduct));

        /* Many keyboards and mice don't like to be polled for reports,
         * so we will always set the HID_QUIRK_NOGET flag for them. */
        if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
                if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
                        interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
                                quirks |= HID_QUIRK_NOGET;
        }

        if (quirks & HID_QUIRK_IGNORE)
                return NULL;

        if ((quirks & HID_QUIRK_IGNORE_MOUSE) &&
                (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE))
                        return NULL;


        if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
            (!interface->desc.bNumEndpoints ||
             usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
                dbg_hid("class descriptor not present\n");
                return NULL;
        }

        for (n = 0; n < hdesc->bNumDescriptors; n++)
                if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
                        rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);

        if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
                dbg_hid("weird size of report descriptor (%u)\n", rsize);
                return NULL;
        }

        if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) {
                dbg_hid("couldn't allocate rdesc memory\n");
                return NULL;
        }

        hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);

        if ((n = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber, HID_DT_REPORT, rdesc, rsize)) < 0) {
                dbg_hid("reading report descriptor failed\n");
                kfree(rdesc);
                return NULL;
        }

        usbhid_fixup_report_descriptor(le16_to_cpu(dev->descriptor.idVendor),
                        le16_to_cpu(dev->descriptor.idProduct), rdesc,
                        rsize, rdesc_quirks_param);

        dbg_hid("report descriptor (size %u, read %d) = ", rsize, n);
        for (n = 0; n < rsize; n++)
                dbg_hid_line(" %02x", (unsigned char) rdesc[n]);
        dbg_hid_line("\n");

        if (!(hid = hid_parse_report(rdesc, n))) {
                dbg_hid("parsing report descriptor failed\n");
                kfree(rdesc);
                return NULL;
        }

        kfree(rdesc);
        hid->quirks = quirks;

        if (!(usbhid = kzalloc(sizeof(struct usbhid_device), GFP_KERNEL)))
                goto fail_no_usbhid;

        hid->driver_data = usbhid;
        usbhid->hid = hid;

        usbhid->bufsize = HID_MIN_BUFFER_SIZE;
        hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
        hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
        hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);

        if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
                usbhid->bufsize = HID_MAX_BUFFER_SIZE;

        hid_find_max_report(hid, HID_INPUT_REPORT, &insize);

        if (insize > HID_MAX_BUFFER_SIZE)
                insize = HID_MAX_BUFFER_SIZE;

        if (hid_alloc_buffers(dev, hid)) {
                hid_free_buffers(dev, hid);
                goto fail;
        }

        for (n = 0; n < interface->desc.bNumEndpoints; n++) {

                struct usb_endpoint_descriptor *endpoint;
                int pipe;
                int interval;

                endpoint = &interface->endpoint[n].desc;
                if ((endpoint->bmAttributes & 3) != 3)          /* Not an interrupt endpoint */
                        continue;

                interval = endpoint->bInterval;

                /* Change the polling interval of mice. */
                if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
                        interval = hid_mousepoll_interval;

                if (usb_endpoint_dir_in(endpoint)) {
                        if (usbhid->urbin)
                                continue;
                        if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
                                goto fail;
                        pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
                        usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
                                         hid_irq_in, hid, interval);
                        usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
                        usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
                } else {
                        if (usbhid->urbout)
                                continue;
                        if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
                                goto fail;
                        pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
                        usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
                                         hid_irq_out, hid, interval);
                        usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
                        usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
                }
        }

        if (!usbhid->urbin) {
                err_hid("couldn't find an input interrupt endpoint");
                goto fail;
        }

        init_waitqueue_head(&hid->wait);

        INIT_WORK(&usbhid->reset_work, hid_reset);
        setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);

        spin_lock_init(&usbhid->inlock);
        spin_lock_init(&usbhid->outlock);
        spin_lock_init(&usbhid->ctrllock);

        hid->version = le16_to_cpu(hdesc->bcdHID);
        hid->country = hdesc->bCountryCode;
        hid->dev = &intf->dev;
        usbhid->intf = intf;
        usbhid->ifnum = interface->desc.bInterfaceNumber;

        hid->name[0] = 0;

        if (dev->manufacturer)
                strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));

        if (dev->product) {
                if (dev->manufacturer)
                        strlcat(hid->name, " ", sizeof(hid->name));
                strlcat(hid->name, dev->product, sizeof(hid->name));
        }

        if (!strlen(hid->name))
                snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
                         le16_to_cpu(dev->descriptor.idVendor),
                         le16_to_cpu(dev->descriptor.idProduct));

        hid->bus = BUS_USB;
        hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
        hid->product = le16_to_cpu(dev->descriptor.idProduct);

        usb_make_path(dev, hid->phys, sizeof(hid->phys));
        strlcat(hid->phys, "/input", sizeof(hid->phys));
        len = strlen(hid->phys);
        if (len < sizeof(hid->phys) - 1)
                snprintf(hid->phys + len, sizeof(hid->phys) - len,
                         "%d", intf->altsetting[0].desc.bInterfaceNumber);

        if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
                hid->uniq[0] = 0;

        usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
        if (!usbhid->urbctrl)
                goto fail;

        usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
                             usbhid->ctrlbuf, 1, hid_ctrl, hid);
        usbhid->urbctrl->setup_dma = usbhid->cr_dma;
        usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
        usbhid->urbctrl->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP);
        hid->hidinput_input_event = usb_hidinput_input_event;
        hid->hid_open = usbhid_open;
        hid->hid_close = usbhid_close;
#ifdef CONFIG_USB_HIDDEV
        hid->hiddev_hid_event = hiddev_hid_event;
        hid->hiddev_report_event = hiddev_report_event;
#endif
        return hid;

fail:
        usb_free_urb(usbhid->urbin);
        usb_free_urb(usbhid->urbout);
        usb_free_urb(usbhid->urbctrl);
        hid_free_buffers(dev, hid);
        kfree(usbhid);
fail_no_usbhid:
        hid_free_device(hid);

        return NULL;
}

static void hid_disconnect(struct usb_interface *intf)
{
        struct hid_device *hid = usb_get_intfdata (intf);
        struct usbhid_device *usbhid;

        if (!hid)
                return;

        usbhid = hid->driver_data;

        spin_lock_irq(&usbhid->inlock); /* Sync with error handler */
        usb_set_intfdata(intf, NULL);
        spin_unlock_irq(&usbhid->inlock);
        usb_kill_urb(usbhid->urbin);
        usb_kill_urb(usbhid->urbout);
        usb_kill_urb(usbhid->urbctrl);

        del_timer_sync(&usbhid->io_retry);
        cancel_work_sync(&usbhid->reset_work);

        if (hid->claimed & HID_CLAIMED_INPUT)
                hidinput_disconnect(hid);
        if (hid->claimed & HID_CLAIMED_HIDDEV)
                hiddev_disconnect(hid);

        usb_free_urb(usbhid->urbin);
        usb_free_urb(usbhid->urbctrl);
        usb_free_urb(usbhid->urbout);

        hid_free_buffers(hid_to_usb_dev(hid), hid);
        kfree(usbhid);
        hid_free_device(hid);
}

static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
        struct hid_device *hid;
        char path[64];
        int i;
        char *c;

        dbg_hid("HID probe called for ifnum %d\n",
                        intf->altsetting->desc.bInterfaceNumber);

        if (!(hid = usb_hid_configure(intf)))
                return -ENODEV;

        usbhid_init_reports(hid);
        hid_dump_device(hid);
        if (hid->quirks & HID_QUIRK_RESET_LEDS)
                usbhid_set_leds(hid);

        if (!hidinput_connect(hid))
                hid->claimed |= HID_CLAIMED_INPUT;
        if (!hiddev_connect(hid))
                hid->claimed |= HID_CLAIMED_HIDDEV;

        usb_set_intfdata(intf, hid);

        if (!hid->claimed) {
                printk ("HID device not claimed by input or hiddev\n");
                hid_disconnect(intf);
                return -ENODEV;
        }

        if ((hid->claimed & HID_CLAIMED_INPUT))
                hid_ff_init(hid);

        if (hid->quirks & HID_QUIRK_SONY_PS3_CONTROLLER)
                hid_fixup_sony_ps3_controller(interface_to_usbdev(intf),
                        intf->cur_altsetting->desc.bInterfaceNumber);

        printk(KERN_INFO);

        if (hid->claimed & HID_CLAIMED_INPUT)
                printk("input");
        if (hid->claimed == (HID_CLAIMED_INPUT | HID_CLAIMED_HIDDEV))
                printk(",");
        if (hid->claimed & HID_CLAIMED_HIDDEV)
                printk("hiddev%d", hid->minor);

        c = "Device";
        for (i = 0; i < hid->maxcollection; i++) {
                if (hid->collection[i].type == HID_COLLECTION_APPLICATION &&
                    (hid->collection[i].usage & HID_USAGE_PAGE) == HID_UP_GENDESK &&
                    (hid->collection[i].usage & 0xffff) < ARRAY_SIZE(hid_types)) {
                        c = hid_types[hid->collection[i].usage & 0xffff];
                        break;
                }
        }

        usb_make_path(interface_to_usbdev(intf), path, 63);

        printk(": USB HID v%x.%02x %s [%s] on %s\n",
                hid->version >> 8, hid->version & 0xff, c, hid->name, path);

        return 0;
}

static int hid_suspend(struct usb_interface *intf, pm_message_t message)
{
        struct hid_device *hid = usb_get_intfdata (intf);
        struct usbhid_device *usbhid = hid->driver_data;

        spin_lock_irq(&usbhid->inlock); /* Sync with error handler */
        set_bit(HID_SUSPENDED, &usbhid->iofl);
        spin_unlock_irq(&usbhid->inlock);
        del_timer(&usbhid->io_retry);
        usb_kill_urb(usbhid->urbin);
        dev_dbg(&intf->dev, "suspend\n");
        return 0;
}

static int hid_resume(struct usb_interface *intf)
{
        struct hid_device *hid = usb_get_intfdata (intf);
        struct usbhid_device *usbhid = hid->driver_data;
        int status;

        clear_bit(HID_SUSPENDED, &usbhid->iofl);
        usbhid->retry_delay = 0;
        status = hid_start_in(hid);
        dev_dbg(&intf->dev, "resume status %d\n", status);
        return status;
}

/* Treat USB reset pretty much the same as suspend/resume */
static int hid_pre_reset(struct usb_interface *intf)
{
        /* FIXME: What if the interface is already suspended? */
        hid_suspend(intf, PMSG_ON);
        return 0;
}

/* Same routine used for post_reset and reset_resume */
static int hid_post_reset(struct usb_interface *intf)
{
        struct usb_device *dev = interface_to_usbdev (intf);

        hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
        /* FIXME: Any more reinitialization needed? */

        return hid_resume(intf);
}

static struct usb_device_id hid_usb_ids [] = {
        { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
                .bInterfaceClass = USB_INTERFACE_CLASS_HID },
        { }                                             /* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, hid_usb_ids);

static struct usb_driver hid_driver = {
        .name =         "usbhid",
        .probe =        hid_probe,
        .disconnect =   hid_disconnect,
        .suspend =      hid_suspend,
        .resume =       hid_resume,
        .reset_resume = hid_post_reset,
        .pre_reset =    hid_pre_reset,
        .post_reset =   hid_post_reset,
        .id_table =     hid_usb_ids,
};

static int __init hid_init(void)
{
        int retval;
        retval = usbhid_quirks_init(quirks_param);
        if (retval)
                goto usbhid_quirks_init_fail;
        retval = hiddev_init();
        if (retval)
                goto hiddev_init_fail;
        retval = usb_register(&hid_driver);
        if (retval)
                goto usb_register_fail;
        info(DRIVER_VERSION ":" DRIVER_DESC);

        return 0;
usb_register_fail:
        hiddev_exit();
hiddev_init_fail:
        usbhid_quirks_exit();
usbhid_quirks_init_fail:
        return retval;
}

static void __exit hid_exit(void)
{
        usb_deregister(&hid_driver);
        hiddev_exit();
        usbhid_quirks_exit();
}

module_init(hid_init);
module_exit(hid_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);