Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/usb/input/hiddev.c b/drivers/usb/input/hiddev.c
new file mode 100644
index 0000000..96b7c90
--- /dev/null
+++ b/drivers/usb/input/hiddev.c
@@ -0,0 +1,844 @@
+/*
+ * 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>
+ */
+
+#include <linux/config.h>
+#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>
+#include <linux/devfs_fs_kernel.h>
+
+#ifdef CONFIG_USB_DYNAMIC_MINORS
+#define HIDDEV_MINOR_BASE 0
+#define HIDDEV_MINORS 256
+#else
+#define HIDDEV_MINOR_BASE 96
+#define HIDDEV_MINORS 16
+#endif
+#define HIDDEV_BUFFER_SIZE 64
+
+struct hiddev {
+ int exist;
+ int open;
+ wait_queue_head_t wait;
+ 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];
+
+/*
+ * 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;
+ 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 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_for_each_entry(report, &report_enum->report_list, 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;
+ }
+ }
+ }
+
+ 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, struct pt_regs *regs)
+{
+ 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;
+}
+
+
+/*
+ * 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
+ kfree(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 = iminor(inode) - 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 __user * buffer, size_t count, loff_t *ppos)
+{
+ return -EINVAL;
+}
+
+/*
+ * "read" file op
+ */
+static ssize_t hiddev_read(struct file * file, char __user * 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;
+}
+
+/*
+ * "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=NULL;
+ struct hiddev_usage_ref *uref;
+ struct hiddev_devinfo dinfo;
+ struct hid_report *report;
+ struct hid_field *field;
+ void __user *user_arg = (void __user *)arg;
+ int i;
+
+ if (!hiddev->exist)
+ return -EIO;
+
+ switch (cmd) {
+
+ case HIDIOCGVERSION:
+ return put_user(HID_VERSION, (int __user *)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 = le16_to_cpu(dev->descriptor.idVendor);
+ dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
+ dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
+ dinfo.num_applications = hid->maxapplication;
+ if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
+ return -EFAULT;
+
+ return 0;
+
+ case HIDIOCGFLAG:
+ if (put_user(list->flags, (int __user *)arg))
+ return -EFAULT;
+
+ return 0;
+
+ case HIDIOCSFLAG:
+ {
+ int newflags;
+ if (get_user(newflags, (int __user *)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 __user *)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(user_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, user_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_submit_report(hid, report, USB_DIR_IN);
+ hid_wait_io(hid);
+
+ return 0;
+
+ case HIDIOCSREPORT:
+ if (copy_from_user(&rinfo, user_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_submit_report(hid, report, USB_DIR_OUT);
+
+ return 0;
+
+ case HIDIOCGREPORTINFO:
+ if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
+ return -EFAULT;
+
+ if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
+ return -EINVAL;
+
+ rinfo.num_fields = report->maxfield;
+
+ if (copy_to_user(user_arg, &rinfo, sizeof(rinfo)))
+ return -EFAULT;
+
+ return 0;
+
+ case HIDIOCGFIELDINFO:
+ if (copy_from_user(&finfo, user_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;
+
+ if (copy_to_user(user_arg, &finfo, sizeof(finfo)))
+ return -EFAULT;
+
+ return 0;
+
+ case HIDIOCGUCODE:
+ uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
+ if (!uref_multi)
+ return -ENOMEM;
+ uref = &uref_multi->uref;
+ if (copy_from_user(uref, user_arg, sizeof(*uref)))
+ goto fault;
+
+ rinfo.report_type = uref->report_type;
+ rinfo.report_id = uref->report_id;
+ if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
+ goto inval;
+
+ if (uref->field_index >= report->maxfield)
+ goto inval;
+
+ field = report->field[uref->field_index];
+ if (uref->usage_index >= field->maxusage)
+ goto inval;
+
+ uref->usage_code = field->usage[uref->usage_index].hid;
+
+ if (copy_to_user(user_arg, uref, sizeof(*uref)))
+ goto fault;
+
+ kfree(uref_multi);
+ return 0;
+
+ case HIDIOCGUSAGE:
+ case HIDIOCSUSAGE:
+ case HIDIOCGUSAGES:
+ case HIDIOCSUSAGES:
+ case HIDIOCGCOLLECTIONINDEX:
+ uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
+ if (!uref_multi)
+ return -ENOMEM;
+ uref = &uref_multi->uref;
+ if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
+ if (copy_from_user(uref_multi, user_arg,
+ sizeof(*uref_multi)))
+ goto fault;
+ } else {
+ if (copy_from_user(uref, user_arg, sizeof(*uref)))
+ goto fault;
+ }
+
+ if (cmd != HIDIOCGUSAGE &&
+ cmd != HIDIOCGUSAGES &&
+ uref->report_type == HID_REPORT_TYPE_INPUT)
+ goto inval;
+
+ if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
+ field = hiddev_lookup_usage(hid, uref);
+ if (field == NULL)
+ goto inval;
+ } else {
+ rinfo.report_type = uref->report_type;
+ rinfo.report_id = uref->report_id;
+ if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
+ goto inval;
+
+ if (uref->field_index >= report->maxfield)
+ goto inval;
+
+ field = report->field[uref->field_index];
+
+ if (cmd == HIDIOCGCOLLECTIONINDEX) {
+ if (uref->usage_index >= field->maxusage)
+ goto inval;
+ } else if (uref->usage_index >= field->report_count)
+ goto inval;
+
+ else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
+ (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
+ uref->usage_index + uref_multi->num_values >= field->report_count))
+ goto inval;
+ }
+
+ switch (cmd) {
+ case HIDIOCGUSAGE:
+ uref->value = field->value[uref->usage_index];
+ if (copy_to_user(user_arg, uref, sizeof(*uref)))
+ goto fault;
+ goto goodreturn;
+
+ case HIDIOCSUSAGE:
+ field->value[uref->usage_index] = uref->value;
+ goto goodreturn;
+
+ case HIDIOCGCOLLECTIONINDEX:
+ kfree(uref_multi);
+ 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(user_arg, uref_multi,
+ sizeof(*uref_multi)))
+ goto fault;
+ goto goodreturn;
+ case HIDIOCSUSAGES:
+ for (i = 0; i < uref_multi->num_values; i++)
+ field->value[uref->usage_index + i] =
+ uref_multi->values[i];
+ goto goodreturn;
+ }
+
+goodreturn:
+ kfree(uref_multi);
+ return 0;
+fault:
+ kfree(uref_multi);
+ return -EFAULT;
+inval:
+ kfree(uref_multi);
+ return -EINVAL;
+
+ case HIDIOCGCOLLECTIONINFO:
+ if (copy_from_user(&cinfo, user_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;
+
+ if (copy_to_user(user_arg, &cinfo, sizeof(cinfo)))
+ return -EFAULT;
+ return 0;
+
+ 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(user_arg, hid->name, len) ?
+ -EFAULT : len;
+ }
+
+ if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
+ int len;
+ if (!hid->phys)
+ return 0;
+ len = strlen(hid->phys) + 1;
+ if (len > _IOC_SIZE(cmd))
+ len = _IOC_SIZE(cmd);
+ return copy_to_user(user_arg, hid->phys, 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,
+};
+
+static struct usb_class_driver hiddev_class = {
+ .name = "usb/hid/hiddev%d",
+ .fops = &hiddev_fops,
+ .mode = S_IFCHR | S_IRUGO | S_IWUSR,
+ .minor_base = HIDDEV_MINOR_BASE,
+};
+
+/*
+ * 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 i;
+ int retval;
+
+ 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 && (hid->quirks & HID_QUIRK_HIDDEV) == 0)
+ return -1;
+
+ if (!(hiddev = kmalloc(sizeof(struct hiddev), GFP_KERNEL)))
+ return -1;
+ memset(hiddev, 0, sizeof(struct hiddev));
+
+ retval = usb_register_dev(hid->intf, &hiddev_class);
+ if (retval) {
+ err("Not able to get a minor for this device.");
+ kfree(hiddev);
+ return -1;
+ }
+
+ init_waitqueue_head(&hiddev->wait);
+
+ hiddev_table[hid->intf->minor - HIDDEV_MINOR_BASE] = hiddev;
+
+ hiddev->hid = hid;
+ hiddev->exist = 1;
+
+ hid->minor = hid->intf->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)
+ */
+static struct usb_class_driver hiddev_class;
+void hiddev_disconnect(struct hid_device *hid)
+{
+ struct hiddev *hiddev = hid->hiddev;
+
+ hiddev->exist = 0;
+
+ hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL;
+ usb_deregister_dev(hiddev->hid->intf, &hiddev_class);
+
+ if (hiddev->open) {
+ hid_close(hiddev->hid);
+ wake_up_interruptible(&hiddev->wait);
+ } else {
+ kfree(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 int hiddev_usbd_probe(struct usb_interface *intf,
+ const struct usb_device_id *hiddev_info)
+{
+ return -ENODEV;
+}
+
+
+static /* const */ struct usb_driver hiddev_driver = {
+ .owner = THIS_MODULE,
+ .name = "hiddev",
+ .probe = hiddev_usbd_probe,
+};
+
+int __init hiddev_init(void)
+{
+ devfs_mk_dir("usb/hid");
+ return usb_register(&hiddev_driver);
+}
+
+void hiddev_exit(void)
+{
+ usb_deregister(&hiddev_driver);
+ devfs_remove("usb/hid");
+}