diff options
Diffstat (limited to 'drivers/hid/usbhid/hiddev.c')
| -rw-r--r-- | drivers/hid/usbhid/hiddev.c | 945 |
1 files changed, 945 insertions, 0 deletions
diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c new file mode 100644 index 0000000000..59cf3ddfdf --- /dev/null +++ b/drivers/hid/usbhid/hiddev.c @@ -0,0 +1,945 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2001 Paul Stewart + * Copyright (c) 2001 Vojtech Pavlik + * + * HID char devices, giving access to raw HID device events. + */ + +/* + * + * 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/poll.h> +#include <linux/slab.h> +#include <linux/sched/signal.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/input.h> +#include <linux/usb.h> +#include <linux/hid.h> +#include <linux/hiddev.h> +#include <linux/compat.h> +#include <linux/vmalloc.h> +#include <linux/nospec.h> +#include "usbhid.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 2048 + +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 list_head node; + struct mutex thread_lock; +}; + +/* + * 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 int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; + unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; + struct hid_report_enum *report_enum; + struct hid_report *report; + 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: + if (list_empty(&report_enum->report_list)) + return NULL; + + list = report_enum->report_list.next; + report = list_entry(list, struct hid_report, list); + rinfo->report_id = report->id; + break; + + case HID_REPORT_ID_NEXT: + report = report_enum->report_id_hash[rid]; + if (!report) + return NULL; + + list = report->list.next; + if (list == &report_enum->report_list) + return NULL; + + report = list_entry(list, struct hid_report, list); + rinfo->report_id = report->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; + unsigned long flags; + + spin_lock_irqsave(&hiddev->list_lock, flags); + list_for_each_entry(list, &hiddev->list, node) { + 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); + } + } + spin_unlock_irqrestore(&hiddev->list_lock, flags); + + 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); +} +EXPORT_SYMBOL_GPL(hiddev_hid_event); + +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) +{ + struct hiddev_list *list = file->private_data; + + return fasync_helper(fd, file, on, &list->fasync); +} + + +/* + * release file op + */ +static int hiddev_release(struct inode * inode, struct file * file) +{ + struct hiddev_list *list = file->private_data; + unsigned long flags; + + spin_lock_irqsave(&list->hiddev->list_lock, flags); + list_del(&list->node); + spin_unlock_irqrestore(&list->hiddev->list_lock, flags); + + mutex_lock(&list->hiddev->existancelock); + if (!--list->hiddev->open) { + if (list->hiddev->exist) { + hid_hw_close(list->hiddev->hid); + hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL); + } else { + mutex_unlock(&list->hiddev->existancelock); + kfree(list->hiddev); + vfree(list); + return 0; + } + } + + mutex_unlock(&list->hiddev->existancelock); + vfree(list); + + return 0; +} + +static int __hiddev_open(struct hiddev *hiddev, struct file *file) +{ + struct hiddev_list *list; + int error; + + lockdep_assert_held(&hiddev->existancelock); + + list = vzalloc(sizeof(*list)); + if (!list) + return -ENOMEM; + + mutex_init(&list->thread_lock); + list->hiddev = hiddev; + + if (!hiddev->open++) { + error = hid_hw_power(hiddev->hid, PM_HINT_FULLON); + if (error < 0) + goto err_drop_count; + + error = hid_hw_open(hiddev->hid); + if (error < 0) + goto err_normal_power; + } + + spin_lock_irq(&hiddev->list_lock); + list_add_tail(&list->node, &hiddev->list); + spin_unlock_irq(&hiddev->list_lock); + + file->private_data = list; + + return 0; + +err_normal_power: + hid_hw_power(hiddev->hid, PM_HINT_NORMAL); +err_drop_count: + hiddev->open--; + vfree(list); + return error; +} + +/* + * open file op + */ +static int hiddev_open(struct inode *inode, struct file *file) +{ + struct usb_interface *intf; + struct hid_device *hid; + struct hiddev *hiddev; + int res; + + intf = usbhid_find_interface(iminor(inode)); + if (!intf) + return -ENODEV; + + hid = usb_get_intfdata(intf); + hiddev = hid->hiddev; + + mutex_lock(&hiddev->existancelock); + res = hiddev->exist ? __hiddev_open(hiddev, file) : -ENODEV; + mutex_unlock(&hiddev->existancelock); + + return res; +} + +/* + * "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) +{ + DEFINE_WAIT(wait); + struct hiddev_list *list = file->private_data; + int event_size; + int retval; + + event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? + sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); + + if (count < event_size) + return 0; + + /* lock against other threads */ + retval = mutex_lock_interruptible(&list->thread_lock); + if (retval) + return -ERESTARTSYS; + + while (retval == 0) { + if (list->head == list->tail) { + prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); + + while (list->head == list->tail) { + if (signal_pending(current)) { + retval = -ERESTARTSYS; + break; + } + if (!list->hiddev->exist) { + retval = -EIO; + break; + } + if (file->f_flags & O_NONBLOCK) { + retval = -EAGAIN; + break; + } + + /* let O_NONBLOCK tasks run */ + mutex_unlock(&list->thread_lock); + schedule(); + if (mutex_lock_interruptible(&list->thread_lock)) { + finish_wait(&list->hiddev->wait, &wait); + return -EINTR; + } + set_current_state(TASK_INTERRUPTIBLE); + } + finish_wait(&list->hiddev->wait, &wait); + + } + + if (retval) { + mutex_unlock(&list->thread_lock); + 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))) { + mutex_unlock(&list->thread_lock); + 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))) { + mutex_unlock(&list->thread_lock); + return -EFAULT; + } + retval += sizeof(struct hiddev_usage_ref); + } + } + list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); + } + + } + mutex_unlock(&list->thread_lock); + + return retval; +} + +/* + * "poll" file op + * No kernel lock - fine + */ +static __poll_t 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 EPOLLIN | EPOLLRDNORM | EPOLLOUT; + if (!list->hiddev->exist) + return EPOLLERR | EPOLLHUP; + return 0; +} + +/* + * "ioctl" file op + */ +static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) +{ + struct hid_device *hid = hiddev->hid; + struct hiddev_report_info rinfo; + struct hiddev_usage_ref_multi *uref_multi = NULL; + struct hiddev_usage_ref *uref; + struct hid_report *report; + struct hid_field *field; + int i; + + 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; + } + + switch (cmd) { + case HIDIOCGUCODE: + 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; + uref->field_index = array_index_nospec(uref->field_index, + report->maxfield); + + field = report->field[uref->field_index]; + if (uref->usage_index >= field->maxusage) + goto inval; + uref->usage_index = array_index_nospec(uref->usage_index, + field->maxusage); + + uref->usage_code = field->usage[uref->usage_index].hid; + + if (copy_to_user(user_arg, uref, sizeof(*uref))) + goto fault; + + goto goodreturn; + + default: + 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; + uref->field_index = array_index_nospec(uref->field_index, + report->maxfield); + + field = report->field[uref->field_index]; + + if (cmd == HIDIOCGCOLLECTIONINDEX) { + if (uref->usage_index >= field->maxusage) + goto inval; + uref->usage_index = + array_index_nospec(uref->usage_index, + field->maxusage); + } else if (uref->usage_index >= field->report_count) + goto inval; + } + + if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { + if (uref_multi->num_values > HID_MAX_MULTI_USAGES || + uref->usage_index + uref_multi->num_values > + field->report_count) + goto inval; + + uref->usage_index = + array_index_nospec(uref->usage_index, + field->report_count - + uref_multi->num_values); + } + + switch (cmd) { + case HIDIOCGUSAGE: + if (uref->usage_index >= field->report_count) + goto inval; + uref->value = field->value[uref->usage_index]; + if (copy_to_user(user_arg, uref, sizeof(*uref))) + goto fault; + goto goodreturn; + + case HIDIOCSUSAGE: + if (uref->usage_index >= field->report_count) + goto inval; + field->value[uref->usage_index] = uref->value; + goto goodreturn; + + case HIDIOCGCOLLECTIONINDEX: + i = field->usage[uref->usage_index].collection_index; + kfree(uref_multi); + return i; + 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; + } +} + +static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) +{ + struct hid_device *hid = hiddev->hid; + struct usb_device *dev = hid_to_usb_dev(hid); + int idx, len; + char *buf; + + if (get_user(idx, (int __user *)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; +} + +static long hiddev_ioctl(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; + struct hiddev_collection_info cinfo; + struct hiddev_report_info rinfo; + struct hiddev_field_info finfo; + struct hiddev_devinfo dinfo; + struct hid_report *report; + struct hid_field *field; + void __user *user_arg = (void __user *)arg; + int i, r = -EINVAL; + + /* Called without BKL by compat methods so no BKL taken */ + + mutex_lock(&hiddev->existancelock); + if (!hiddev->exist) { + r = -ENODEV; + goto ret_unlock; + } + + hid = hiddev->hid; + + switch (cmd) { + + case HIDIOCGVERSION: + r = put_user(HID_VERSION, (int __user *)arg) ? + -EFAULT : 0; + break; + + case HIDIOCAPPLICATION: + if (arg >= hid->maxapplication) + break; + + for (i = 0; i < hid->maxcollection; i++) + if (hid->collection[i].type == + HID_COLLECTION_APPLICATION && arg-- == 0) + break; + + if (i < hid->maxcollection) + r = hid->collection[i].usage; + break; + + case HIDIOCGDEVINFO: + { + struct usb_device *dev = hid_to_usb_dev(hid); + struct usbhid_device *usbhid = hid->driver_data; + + memset(&dinfo, 0, sizeof(dinfo)); + + dinfo.bustype = BUS_USB; + dinfo.busnum = dev->bus->busnum; + dinfo.devnum = dev->devnum; + dinfo.ifnum = usbhid->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; + + r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ? + -EFAULT : 0; + break; + } + + case HIDIOCGFLAG: + r = put_user(list->flags, (int __user *)arg) ? + -EFAULT : 0; + break; + + case HIDIOCSFLAG: + { + int newflags; + + if (get_user(newflags, (int __user *)arg)) { + r = -EFAULT; + break; + } + + if ((newflags & ~HIDDEV_FLAGS) != 0 || + ((newflags & HIDDEV_FLAG_REPORT) != 0 && + (newflags & HIDDEV_FLAG_UREF) == 0)) + break; + + list->flags = newflags; + + r = 0; + break; + } + + case HIDIOCGSTRING: + r = hiddev_ioctl_string(hiddev, cmd, user_arg); + break; + + case HIDIOCINITREPORT: + usbhid_init_reports(hid); + hiddev->initialized = true; + r = 0; + break; + + case HIDIOCGREPORT: + if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { + r = -EFAULT; + break; + } + + if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) + break; + + report = hiddev_lookup_report(hid, &rinfo); + if (report == NULL) + break; + + hid_hw_request(hid, report, HID_REQ_GET_REPORT); + hid_hw_wait(hid); + + r = 0; + break; + + case HIDIOCSREPORT: + if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { + r = -EFAULT; + break; + } + + if (rinfo.report_type == HID_REPORT_TYPE_INPUT) + break; + + report = hiddev_lookup_report(hid, &rinfo); + if (report == NULL) + break; + + hid_hw_request(hid, report, HID_REQ_SET_REPORT); + hid_hw_wait(hid); + + r = 0; + break; + + case HIDIOCGREPORTINFO: + if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { + r = -EFAULT; + break; + } + + report = hiddev_lookup_report(hid, &rinfo); + if (report == NULL) + break; + + rinfo.num_fields = report->maxfield; + + r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? + -EFAULT : 0; + break; + + case HIDIOCGFIELDINFO: + if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { + r = -EFAULT; + break; + } + + rinfo.report_type = finfo.report_type; + rinfo.report_id = finfo.report_id; + + report = hiddev_lookup_report(hid, &rinfo); + if (report == NULL) + break; + + if (finfo.field_index >= report->maxfield) + break; + finfo.field_index = array_index_nospec(finfo.field_index, + report->maxfield); + + 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; + + r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? + -EFAULT : 0; + break; + + case HIDIOCGUCODE: + case HIDIOCGUSAGE: + case HIDIOCSUSAGE: + case HIDIOCGUSAGES: + case HIDIOCSUSAGES: + case HIDIOCGCOLLECTIONINDEX: + if (!hiddev->initialized) { + usbhid_init_reports(hid); + hiddev->initialized = true; + } + r = hiddev_ioctl_usage(hiddev, cmd, user_arg); + break; + + case HIDIOCGCOLLECTIONINFO: + if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { + r = -EFAULT; + break; + } + + if (cinfo.index >= hid->maxcollection) + break; + cinfo.index = array_index_nospec(cinfo.index, + hid->maxcollection); + + cinfo.type = hid->collection[cinfo.index].type; + cinfo.usage = hid->collection[cinfo.index].usage; + cinfo.level = hid->collection[cinfo.index].level; + + r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? + -EFAULT : 0; + break; + + default: + if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) + break; + + if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { + int len = strlen(hid->name) + 1; + if (len > _IOC_SIZE(cmd)) + len = _IOC_SIZE(cmd); + r = copy_to_user(user_arg, hid->name, len) ? + -EFAULT : len; + break; + } + + if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { + int len = strlen(hid->phys) + 1; + if (len > _IOC_SIZE(cmd)) + len = _IOC_SIZE(cmd); + r = copy_to_user(user_arg, hid->phys, len) ? + -EFAULT : len; + break; + } + } + +ret_unlock: + mutex_unlock(&hiddev->existancelock); + return r; +} + +static const struct file_operations hiddev_fops = { + .owner = THIS_MODULE, + .read = hiddev_read, + .write = hiddev_write, + .poll = hiddev_poll, + .open = hiddev_open, + .release = hiddev_release, + .unlocked_ioctl = hiddev_ioctl, + .fasync = hiddev_fasync, + .compat_ioctl = compat_ptr_ioctl, + .llseek = noop_llseek, +}; + +static char *hiddev_devnode(const struct device *dev, umode_t *mode) +{ + return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); +} + +static struct usb_class_driver hiddev_class = { + .name = "hiddev%d", + .devnode = hiddev_devnode, + .fops = &hiddev_fops, + .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, unsigned int force) +{ + struct hiddev *hiddev; + struct usbhid_device *usbhid = hid->driver_data; + int retval; + + if (!force) { + unsigned int i; + 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 -EINVAL; + } + + if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) + return -ENOMEM; + + init_waitqueue_head(&hiddev->wait); + INIT_LIST_HEAD(&hiddev->list); + spin_lock_init(&hiddev->list_lock); + mutex_init(&hiddev->existancelock); + hid->hiddev = hiddev; + hiddev->hid = hid; + hiddev->exist = 1; + retval = usb_register_dev(usbhid->intf, &hiddev_class); + if (retval) { + hid_err(hid, "Not able to get a minor for this device\n"); + hid->hiddev = NULL; + kfree(hiddev); + return retval; + } + + /* + * If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize + * the reports. + */ + hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS; + + hiddev->minor = usbhid->intf->minor; + + 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; + struct usbhid_device *usbhid = hid->driver_data; + + usb_deregister_dev(usbhid->intf, &hiddev_class); + + mutex_lock(&hiddev->existancelock); + hiddev->exist = 0; + + if (hiddev->open) { + hid_hw_close(hiddev->hid); + wake_up_interruptible(&hiddev->wait); + mutex_unlock(&hiddev->existancelock); + } else { + mutex_unlock(&hiddev->existancelock); + kfree(hiddev); + } +} |