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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [usb/] [hiddev.c] - Blame information for rev 1275

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/*
 *  Copyright (c) 2001 Paul Stewart
 *  Copyright (c) 2001 Vojtech Pavlik
 *
 *  HID char devices, giving access to raw HID device events.
 *
 */
 
/*
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to Paul Stewart <stewart@wetlogic.net>
 */
 
#define HIDDEV_MINOR_BASE       96
#define HIDDEV_MINORS           16
#define HIDDEV_BUFFER_SIZE      64
 
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/input.h>
#include <linux/usb.h>
#include "hid.h"
#include <linux/hiddev.h>
 
struct hiddev {
        int exist;
        int open;
        int minor;
        wait_queue_head_t wait;
        devfs_handle_t devfs;
        struct hid_device *hid;
        struct hiddev_list *list;
};
 
struct hiddev_list {
        struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
        int head;
        int tail;
        unsigned flags;
        struct fasync_struct *fasync;
        struct hiddev *hiddev;
        struct hiddev_list *next;
};
 
static struct hiddev *hiddev_table[HIDDEV_MINORS];
static devfs_handle_t hiddev_devfs_handle;
 
/*
 * Find a report, given the report's type and ID.  The ID can be specified
 * indirectly by REPORT_ID_FIRST (which returns the first report of the given
 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
 * given type which follows old_id.
 */
static struct hid_report *
hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
{
        unsigned flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
        struct hid_report_enum *report_enum = NULL;
        struct list_head *list;
 
        if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
            rinfo->report_type > HID_REPORT_TYPE_MAX) return NULL;
 
        report_enum = hid->report_enum +
                (rinfo->report_type - HID_REPORT_TYPE_MIN);
 
        switch (flags) {
        case 0: /* Nothing to do -- report_id is already set correctly */
                break;
 
        case HID_REPORT_ID_FIRST:
                list = report_enum->report_list.next;
                if (list == &report_enum->report_list) return NULL;
                rinfo->report_id = ((struct hid_report *) list)->id;
                break;
 
        case HID_REPORT_ID_NEXT:
                list = (struct list_head *)
                        report_enum->report_id_hash[rinfo->report_id &
                                                    HID_REPORT_ID_MASK];
                if (list == NULL) return NULL;
                list = list->next;
                if (list == &report_enum->report_list) return NULL;
                rinfo->report_id = ((struct hid_report *) list)->id;
                break;
 
        default:
                return NULL;
        }
 
        return report_enum->report_id_hash[rinfo->report_id];
}
 
/*
 * Perform an exhaustive search of the report table for a usage, given its
 * type and usage id.
 */
static struct hid_field *
hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
{
        int i, j;
        struct hid_report *report;
        struct hid_report_enum *report_enum;
        struct list_head *list;
        struct hid_field *field;
 
        if (uref->report_type < HID_REPORT_TYPE_MIN ||
            uref->report_type > HID_REPORT_TYPE_MAX) return NULL;
 
        report_enum = hid->report_enum +
                (uref->report_type - HID_REPORT_TYPE_MIN);
        list = report_enum->report_list.next;
        while (list != &report_enum->report_list) {
                report = (struct hid_report *) list;
                for (i = 0; i < report->maxfield; i++) {
                        field = report->field[i];
                        for (j = 0; j < field->maxusage; j++) {
                                if (field->usage[j].hid == uref->usage_code) {
                                        uref->report_id = report->id;
                                        uref->field_index = i;
                                        uref->usage_index = j;
                                        return field;
                                }
                        }
                }
                list = list->next;
        }
 
        return NULL;
}
 
static void hiddev_send_event(struct hid_device *hid,
                              struct hiddev_usage_ref *uref)
{
        struct hiddev *hiddev = hid->hiddev;
        struct hiddev_list *list = hiddev->list;
 
        while (list) {
                if (uref->field_index != HID_FIELD_INDEX_NONE ||
                    (list->flags & HIDDEV_FLAG_REPORT) != 0) {
                        list->buffer[list->head] = *uref;
                        list->head = (list->head + 1) &
                                (HIDDEV_BUFFER_SIZE - 1);
                        kill_fasync(&list->fasync, SIGIO, POLL_IN);
                }
 
                list = list->next;
        }
 
        wake_up_interruptible(&hiddev->wait);
}
 
/*
 * This is where hid.c calls into hiddev to pass an event that occurred over
 * the interrupt pipe
 */
void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
                      struct hid_usage *usage, __s32 value)
{
        unsigned type = field->report_type;
        struct hiddev_usage_ref uref;
 
        uref.report_type =
          (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
          ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
           ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE:0));
        uref.report_id = field->report->id;
        uref.field_index = field->index;
        uref.usage_index = (usage - field->usage);
        uref.usage_code = usage->hid;
        uref.value = value;
 
        hiddev_send_event(hid, &uref);
}
 
 
void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
{
        unsigned type = report->type;
        struct hiddev_usage_ref uref;
 
        memset(&uref, 0, sizeof(uref));
        uref.report_type =
          (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
          ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
           ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE:0));
        uref.report_id = report->id;
        uref.field_index = HID_FIELD_INDEX_NONE;
 
        hiddev_send_event(hid, &uref);
}
 
/*
 * fasync file op
 */
static int hiddev_fasync(int fd, struct file *file, int on)
{
        int retval;
        struct hiddev_list *list = file->private_data;
        retval = fasync_helper(fd, file, on, &list->fasync);
        return retval < 0 ? retval : 0;
}
 
/*
 * De-allocate a hiddev structure
 */
static void hiddev_cleanup(struct hiddev *hiddev)
{
        devfs_unregister(hiddev->devfs);
        hiddev_table[hiddev->minor] = NULL;
        kfree(hiddev);
}
 
/*
 * release file op
 */
static int hiddev_release(struct inode * inode, struct file * file)
{
        struct hiddev_list *list = file->private_data;
        struct hiddev_list **listptr;
 
        listptr = &list->hiddev->list;
        hiddev_fasync(-1, file, 0);
 
        while (*listptr && (*listptr != list))
                listptr = &((*listptr)->next);
        *listptr = (*listptr)->next;
 
        if (!--list->hiddev->open) {
                if (list->hiddev->exist)
                        hid_close(list->hiddev->hid);
                else
                        hiddev_cleanup(list->hiddev);
        }
 
        kfree(list);
 
        return 0;
}
 
/*
 * open file op
 */
static int hiddev_open(struct inode * inode, struct file * file) {
        struct hiddev_list *list;
 
        int i = MINOR(inode->i_rdev) - HIDDEV_MINOR_BASE;
 
        if (i >= HIDDEV_MINORS || !hiddev_table[i])
                return -ENODEV;
 
        if (!(list = kmalloc(sizeof(struct hiddev_list), GFP_KERNEL)))
                return -ENOMEM;
        memset(list, 0, sizeof(struct hiddev_list));
 
        list->hiddev = hiddev_table[i];
        list->next = hiddev_table[i]->list;
        hiddev_table[i]->list = list;
 
        file->private_data = list;
 
        if (!list->hiddev->open++)
                if (list->hiddev->exist)
                        hid_open(hiddev_table[i]->hid);
 
        return 0;
}
 
/*
 * "write" file op
 */
static ssize_t hiddev_write(struct file * file, const char * buffer,
                            size_t count, loff_t *ppos)
{
        return -EINVAL;
}
 
/*
 * "read" file op
 */
static ssize_t hiddev_read(struct file * file, char * buffer, size_t count,
                           loff_t *ppos)
{
        DECLARE_WAITQUEUE(wait, current);
        struct hiddev_list *list = file->private_data;
        int event_size;
        int retval = 0;
 
        event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
                sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
 
        if (count < event_size) return 0;
 
        while (retval == 0) {
                if (list->head == list->tail) {
                        add_wait_queue(&list->hiddev->wait, &wait);
                        set_current_state(TASK_INTERRUPTIBLE);
 
                        while (list->head == list->tail) {
                                if (file->f_flags & O_NONBLOCK) {
                                        retval = -EAGAIN;
                                        break;
                                }
                                if (signal_pending(current)) {
                                        retval = -ERESTARTSYS;
                                        break;
                                }
                                if (!list->hiddev->exist) {
                                        retval = -EIO;
                                        break;
                                }
 
                                schedule();
                        }
 
                        set_current_state(TASK_RUNNING);
                        remove_wait_queue(&list->hiddev->wait, &wait);
                }
 
                if (retval)
                        return retval;
 
                while (list->head != list->tail &&
                       retval + event_size <= count) {
                        if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
                                if (list->buffer[list->tail].field_index !=
                                    HID_FIELD_INDEX_NONE) {
                                        struct hiddev_event event;
                                        event.hid = list->buffer[list->tail].usage_code;
                                        event.value = list->buffer[list->tail].value;
                                        if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event)))
                                                return -EFAULT;
                                        retval += sizeof(struct hiddev_event);
                                }
                        } else {
                                if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
                                    (list->flags & HIDDEV_FLAG_REPORT) != 0) {
                                        if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref)))
                                                return -EFAULT;
                                        retval += sizeof(struct hiddev_usage_ref);
                                }
                        }
                        list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
                }
 
        }
 
        return retval;
}
 
/*
 * "poll" file op
 * No kernel lock - fine
 */
static unsigned int hiddev_poll(struct file *file, poll_table *wait)
{
        struct hiddev_list *list = file->private_data;
        poll_wait(file, &list->hiddev->wait, wait);
        if (list->head != list->tail)
                return POLLIN | POLLRDNORM;
        if (!list->hiddev->exist)
                return POLLERR | POLLHUP;
        return 0;
}
 
#define GET_TIMEOUT 3
#define SET_TIMEOUT 3
 
/*
 * "ioctl" file op
 */
static int hiddev_ioctl(struct inode *inode, struct file *file,
                        unsigned int cmd, unsigned long arg)
{
        struct hiddev_list *list = file->private_data;
        struct hiddev *hiddev = list->hiddev;
        struct hid_device *hid = hiddev->hid;
        struct usb_device *dev = hid->dev;
        struct hiddev_collection_info cinfo;
        struct hiddev_report_info rinfo;
        struct hiddev_field_info finfo;
        struct hiddev_usage_ref_multi uref_multi;
        struct hiddev_usage_ref *uref = &uref_multi.uref;
        struct hiddev_devinfo dinfo;
        struct hid_report *report;
        struct hid_field *field;
        int i;
 
        if (!hiddev->exist) return -EIO;
 
        switch (cmd) {
 
        case HIDIOCGVERSION:
                return put_user(HID_VERSION, (int *) arg);
 
        case HIDIOCAPPLICATION:
                if (arg < 0 || arg >= hid->maxapplication)
                        return -EINVAL;
 
                for (i = 0; i < hid->maxcollection; i++)
                        if (hid->collection[i].type ==
                            HID_COLLECTION_APPLICATION && arg-- == 0)
                                break;
 
                if (i == hid->maxcollection)
                        return -EINVAL;
 
                return hid->collection[i].usage;
 
        case HIDIOCGDEVINFO:
                dinfo.bustype = BUS_USB;
                dinfo.busnum = dev->bus->busnum;
                dinfo.devnum = dev->devnum;
                dinfo.ifnum = hid->ifnum;
                dinfo.vendor = dev->descriptor.idVendor;
                dinfo.product = dev->descriptor.idProduct;
                dinfo.version = dev->descriptor.bcdDevice;
                dinfo.num_applications = hid->maxapplication;
                return copy_to_user((void *) arg, &dinfo, sizeof(dinfo));
 
        case HIDIOCGFLAG:
                return put_user(list->flags, (int *) arg);
 
        case HIDIOCSFLAG:
                {
                        int newflags;
                        if (get_user(newflags, (int *) arg))
                                return -EFAULT;
 
                        if ((newflags & ~HIDDEV_FLAGS) != 0 ||
                            ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
                             (newflags & HIDDEV_FLAG_UREF) == 0))
                                return -EINVAL;
 
                        list->flags = newflags;
 
                        return 0;
                }
 
        case HIDIOCGSTRING:
                {
                        int idx, len;
                        char *buf;
 
                        if (get_user(idx, (int *) arg))
                                return -EFAULT;
 
                        if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
                                return -ENOMEM;
 
                        if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
                                kfree(buf);
                                return -EINVAL;
                        }
 
                        if (copy_to_user((void *) (arg+sizeof(int)), buf, len+1)) {
                                kfree(buf);
                                return -EFAULT;
                        }
 
                        kfree(buf);
 
                        return len;
                }
 
        case HIDIOCINITREPORT:
                hid_init_reports(hid);
 
                return 0;
 
        case HIDIOCGREPORT:
                if (copy_from_user(&rinfo, (void *) arg, sizeof(rinfo)))
                        return -EFAULT;
 
                if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
                        return -EINVAL;
 
                if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
                        return -EINVAL;
 
                hid_read_report(hid, report);
 
                return 0;
 
        case HIDIOCSREPORT:
                if (copy_from_user(&rinfo, (void *) arg, sizeof(rinfo)))
                        return -EFAULT;
 
                if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
                        return -EINVAL;
 
                if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
                        return -EINVAL;
 
                hid_write_report(hid, report);
 
                return 0;
 
        case HIDIOCGREPORTINFO:
                if (copy_from_user(&rinfo, (void *) arg, sizeof(rinfo)))
                        return -EFAULT;
 
                if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
                        return -EINVAL;
 
                rinfo.num_fields = report->maxfield;
 
                return copy_to_user((void *) arg, &rinfo, sizeof(rinfo));
 
        case HIDIOCGFIELDINFO:
                if (copy_from_user(&finfo, (void *) arg, sizeof(finfo)))
                        return -EFAULT;
                rinfo.report_type = finfo.report_type;
                rinfo.report_id = finfo.report_id;
                if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
                        return -EINVAL;
 
                if (finfo.field_index >= report->maxfield)
                        return -EINVAL;
 
                field = report->field[finfo.field_index];
                memset(&finfo, 0, sizeof(finfo));
                finfo.report_type = rinfo.report_type;
                finfo.report_id = rinfo.report_id;
                finfo.field_index = field->report_count - 1;
                finfo.maxusage = field->maxusage;
                finfo.flags = field->flags;
                finfo.physical = field->physical;
                finfo.logical = field->logical;
                finfo.application = field->application;
                finfo.logical_minimum = field->logical_minimum;
                finfo.logical_maximum = field->logical_maximum;
                finfo.physical_minimum = field->physical_minimum;
                finfo.physical_maximum = field->physical_maximum;
                finfo.unit_exponent = field->unit_exponent;
                finfo.unit = field->unit;
 
                return copy_to_user((void *) arg, &finfo, sizeof(finfo));
 
        case HIDIOCGUCODE:
                if (copy_from_user(uref, (void *) arg, sizeof(*uref)))
                        return -EFAULT;
 
                rinfo.report_type = uref->report_type;
                rinfo.report_id = uref->report_id;
                if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
                        return -EINVAL;
 
                if (uref->field_index >= report->maxfield)
                        return -EINVAL;
 
                field = report->field[uref->field_index];
                if (uref->usage_index >= field->maxusage)
                        return -EINVAL;
 
                uref->usage_code = field->usage[uref->usage_index].hid;
 
                return copy_to_user((void *) arg, uref, sizeof(*uref));
 
        case HIDIOCGUSAGE:
        case HIDIOCSUSAGE:
        case HIDIOCGUSAGES:
        case HIDIOCSUSAGES:
        case HIDIOCGCOLLECTIONINDEX:
                if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
                        if (copy_from_user(&uref_multi, (void *) arg,
                                           sizeof(uref_multi)))
                                return -EFAULT;
                } else {
                        if (copy_from_user(uref, (void *) arg, sizeof(*uref)))
                                return -EFAULT;
                }
 
                if (cmd != HIDIOCGUSAGE &&
                    cmd != HIDIOCGUSAGES &&
                    uref->report_type == HID_REPORT_TYPE_INPUT)
                        return -EINVAL;
 
                if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
                        field = hiddev_lookup_usage(hid, uref);
                        if (field == NULL)
                                return -EINVAL;
                } else {
                        rinfo.report_type = uref->report_type;
                        rinfo.report_id = uref->report_id;
                        if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
                                return -EINVAL;
 
                        if (uref->field_index >= report->maxfield)
                                return -EINVAL;
 
                        field = report->field[uref->field_index];
                        if (uref->usage_index >= field->maxusage)
                                return -EINVAL;
 
                        if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
                                if (uref_multi.num_values >= HID_MAX_USAGES ||
                                    uref->usage_index >= field->maxusage ||
                                   (uref->usage_index + uref_multi.num_values) >= field->maxusage)
                                        return -EINVAL;
                        }
                }
 
                switch (cmd) {
                case HIDIOCGUSAGE:
                        uref->value = field->value[uref->usage_index];
                        return copy_to_user((void *) arg, uref, sizeof(*uref));
 
                case HIDIOCSUSAGE:
                        field->value[uref->usage_index] = uref->value;
                        return 0;
 
                case HIDIOCGCOLLECTIONINDEX:
                        return field->usage[uref->usage_index].collection_index;
                case HIDIOCGUSAGES:
                        for (i = 0; i < uref_multi.num_values; i++)
                                uref_multi.values[i] =
                                    field->value[uref->usage_index + i];
                        if (copy_to_user((void *) arg, &uref_multi,
                                         sizeof(uref_multi)))
                                return -EFAULT;
                        return 0;
                case HIDIOCSUSAGES:
                        for (i = 0; i < uref_multi.num_values; i++)
                                field->value[uref->usage_index + i] =
                                    uref_multi.values[i];
                        return 0;
                }
                break;
 
        case HIDIOCGCOLLECTIONINFO:
                if (copy_from_user(&cinfo, (void *) arg, sizeof(cinfo)))
                        return -EFAULT;
 
                if (cinfo.index >= hid->maxcollection)
                        return -EINVAL;
 
                cinfo.type = hid->collection[cinfo.index].type;
                cinfo.usage = hid->collection[cinfo.index].usage;
                cinfo.level = hid->collection[cinfo.index].level;
 
                return copy_to_user((void *) arg, &cinfo, sizeof(cinfo));
 
        default:
 
                if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
                        return -EINVAL;
 
                if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
                        int len;
                        if (!hid->name) return 0;
                        len = strlen(hid->name) + 1;
                        if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
                        return copy_to_user((char *) arg, hid->name, len) ?
                                -EFAULT : len;
                }
        }
        return -EINVAL;
}
 
static struct file_operations hiddev_fops = {
        owner:          THIS_MODULE,
        read:           hiddev_read,
        write:          hiddev_write,
        poll:           hiddev_poll,
        open:           hiddev_open,
        release:        hiddev_release,
        ioctl:          hiddev_ioctl,
        fasync:         hiddev_fasync,
};
 
/*
 * This is where hid.c calls us to connect a hid device to the hiddev driver
 */
int hiddev_connect(struct hid_device *hid)
{
        struct hiddev *hiddev;
        int minor, i;
        char devfs_name[16];
 
 
 
        if ((hid->quirks & HID_QUIRK_HIDDEV) == 0) {
                for (i = 0; i < hid->maxcollection; i++)
                        if (hid->collection[i].type ==
                            HID_COLLECTION_APPLICATION &&
                            !IS_INPUT_APPLICATION(hid->collection[i].usage))
                                break;
 
                if (i == hid->maxcollection)
                        return -1;
        }
 
        for (minor = 0; minor < HIDDEV_MINORS && hiddev_table[minor]; minor++);
        if (minor == HIDDEV_MINORS) {
                printk(KERN_ERR "hiddev: no more free hiddev devices\n");
                return -1;
        }
 
        if (!(hiddev = kmalloc(sizeof(struct hiddev), GFP_KERNEL)))
                return -1;
        memset(hiddev, 0, sizeof(struct hiddev));
 
        init_waitqueue_head(&hiddev->wait);
 
        hiddev->minor = minor;
        hiddev_table[minor] = hiddev;
 
        hiddev->hid = hid;
        hiddev->exist = 1;
 
        sprintf(devfs_name, "hiddev%d", minor);
        hiddev->devfs = devfs_register(hiddev_devfs_handle, devfs_name,
                                       DEVFS_FL_DEFAULT, USB_MAJOR,
                                       minor + HIDDEV_MINOR_BASE,
                                       S_IFCHR | S_IRUGO | S_IWUSR,
                                       &hiddev_fops, NULL);
        hid->minor = minor;
        hid->hiddev = hiddev;
 
        return 0;
}
 
/*
 * This is where hid.c calls us to disconnect a hiddev device from the
 * corresponding hid device (usually because the usb device has disconnected)
 */
void hiddev_disconnect(struct hid_device *hid)
{
        struct hiddev *hiddev = hid->hiddev;
 
        hiddev->exist = 0;
 
        if (hiddev->open) {
                hid_close(hiddev->hid);
                wake_up_interruptible(&hiddev->wait);
        } else {
                hiddev_cleanup(hiddev);
        }
}
 
/* Currently this driver is a USB driver.  It's not a conventional one in
 * the sense that it doesn't probe at the USB level.  Instead it waits to
 * be connected by HID through the hiddev_connect / hiddev_disconnect
 * routines.  The reason to register as a USB device is to gain part of the
 * minor number space from the USB major.
 *
 * In theory, should the HID code be generalized to more than one physical
 * medium (say, IEEE 1384), this driver will probably need to register its
 * own major number, and in doing so, no longer need to register with USB.
 * At that point the probe routine and hiddev_driver struct below will no
 * longer be useful.
 */
 
 
/* We never attach in this manner, and rely on HID to connect us.  This
 * is why there is no disconnect routine defined in the usb_driver either.
 */
static void *hiddev_usbd_probe(struct usb_device *dev, unsigned int ifnum,
                          const struct usb_device_id *hiddev_info)
{
        return NULL;
}
 
 
static /* const */ struct usb_driver hiddev_driver = {
        name:   "hiddev",
        probe:  hiddev_usbd_probe,
        fops:   &hiddev_fops,
        minor:  HIDDEV_MINOR_BASE
};
 
int __init hiddev_init(void)
{
        hiddev_devfs_handle =
                devfs_mk_dir(devfs_find_handle(NULL, "usb", 0, 0, 0, 0), "hid", NULL);
        usb_register(&hiddev_driver);
        return 0;
}
 
void __exit hiddev_exit(void)
{
        devfs_unregister(hiddev_devfs_handle);
        usb_deregister(&hiddev_driver);
}
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [usb/] [hiddev.c] - Blame information for rev 1275

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* Copyright (c) 2001 Paul Stewart`
3			`* Copyright (c) 2001 Vojtech Pavlik`
4			`*`
5			`* HID char devices, giving access to raw HID device events.`
6			`*`
7			`*/`
8
9			`/*`
10			`* This program is free software; you can redistribute it and/or modify`
11			`* it under the terms of the GNU General Public License as published by`
12			`* the Free Software Foundation; either version 2 of the License, or`
13			`* (at your option) any later version.`
14			`*`
15			`* This program is distributed in the hope that it will be useful,`
16			`* but WITHOUT ANY WARRANTY; without even the implied warranty of`
17			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
18			`* GNU General Public License for more details.`
19			`*`
20			`* You should have received a copy of the GNU General Public License`
21			`* along with this program; if not, write to the Free Software`
22			`* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA`
23			`*`
24			`* Should you need to contact me, the author, you can do so either by`
25			`* e-mail - mail your message to Paul Stewart <stewart@wetlogic.net>`
26			`*/`
27
28			`#define HIDDEV_MINOR_BASE 96`
29			`#define HIDDEV_MINORS 16`
30			`#define HIDDEV_BUFFER_SIZE 64`
31
32			`#include <linux/poll.h>`
33			`#include <linux/slab.h>`
34			`#include <linux/module.h>`
35			`#include <linux/init.h>`
36			`#include <linux/smp_lock.h>`
37			`#include <linux/input.h>`
38			`#include <linux/usb.h>`
39			`#include "hid.h"`
40			`#include <linux/hiddev.h>`