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649 lines
14 KiB
649 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* HID raw devices, giving access to raw HID events. |
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* |
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* In comparison to hiddev, this device does not process the |
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* hid events at all (no parsing, no lookups). This lets applications |
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* to work on raw hid events as they want to, and avoids a need to |
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* use a transport-specific userspace libhid/libusb libraries. |
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* |
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* Copyright (c) 2007-2014 Jiri Kosina |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/fs.h> |
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/cdev.h> |
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#include <linux/poll.h> |
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#include <linux/device.h> |
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#include <linux/major.h> |
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#include <linux/slab.h> |
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#include <linux/hid.h> |
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#include <linux/mutex.h> |
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#include <linux/sched/signal.h> |
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#include <linux/string.h> |
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|
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#include <linux/hidraw.h> |
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|
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static int hidraw_major; |
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static struct cdev hidraw_cdev; |
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static struct class *hidraw_class; |
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static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; |
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static DECLARE_RWSEM(minors_rwsem); |
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|
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static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) |
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{ |
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struct hidraw_list *list = file->private_data; |
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int ret = 0, len; |
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DECLARE_WAITQUEUE(wait, current); |
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|
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mutex_lock(&list->read_mutex); |
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|
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while (ret == 0) { |
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if (list->head == list->tail) { |
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add_wait_queue(&list->hidraw->wait, &wait); |
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set_current_state(TASK_INTERRUPTIBLE); |
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|
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while (list->head == list->tail) { |
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if (signal_pending(current)) { |
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ret = -ERESTARTSYS; |
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break; |
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} |
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if (!list->hidraw->exist) { |
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ret = -EIO; |
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break; |
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} |
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if (file->f_flags & O_NONBLOCK) { |
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ret = -EAGAIN; |
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break; |
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} |
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/* allow O_NONBLOCK to work well from other threads */ |
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mutex_unlock(&list->read_mutex); |
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schedule(); |
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mutex_lock(&list->read_mutex); |
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set_current_state(TASK_INTERRUPTIBLE); |
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} |
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set_current_state(TASK_RUNNING); |
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remove_wait_queue(&list->hidraw->wait, &wait); |
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} |
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if (ret) |
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goto out; |
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len = list->buffer[list->tail].len > count ? |
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count : list->buffer[list->tail].len; |
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|
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if (list->buffer[list->tail].value) { |
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if (copy_to_user(buffer, list->buffer[list->tail].value, len)) { |
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ret = -EFAULT; |
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goto out; |
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} |
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ret = len; |
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} |
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kfree(list->buffer[list->tail].value); |
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list->buffer[list->tail].value = NULL; |
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list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); |
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} |
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out: |
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mutex_unlock(&list->read_mutex); |
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return ret; |
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} |
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|
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/* |
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* The first byte of the report buffer is expected to be a report number. |
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*/ |
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static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type) |
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{ |
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unsigned int minor = iminor(file_inode(file)); |
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struct hid_device *dev; |
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__u8 *buf; |
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int ret = 0; |
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lockdep_assert_held(&minors_rwsem); |
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if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
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ret = -ENODEV; |
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goto out; |
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} |
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dev = hidraw_table[minor]->hid; |
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|
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if (count > HID_MAX_BUFFER_SIZE) { |
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hid_warn(dev, "pid %d passed too large report\n", |
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task_pid_nr(current)); |
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ret = -EINVAL; |
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goto out; |
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} |
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if (count < 2) { |
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hid_warn(dev, "pid %d passed too short report\n", |
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task_pid_nr(current)); |
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ret = -EINVAL; |
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goto out; |
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} |
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buf = memdup_user(buffer, count); |
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if (IS_ERR(buf)) { |
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ret = PTR_ERR(buf); |
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goto out; |
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} |
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if ((report_type == HID_OUTPUT_REPORT) && |
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!(dev->quirks & HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP)) { |
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ret = hid_hw_output_report(dev, buf, count); |
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/* |
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* compatibility with old implementation of USB-HID and I2C-HID: |
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* if the device does not support receiving output reports, |
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* on an interrupt endpoint, fallback to SET_REPORT HID command. |
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*/ |
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if (ret != -ENOSYS) |
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goto out_free; |
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} |
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ret = hid_hw_raw_request(dev, buf[0], buf, count, report_type, |
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HID_REQ_SET_REPORT); |
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out_free: |
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kfree(buf); |
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out: |
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return ret; |
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} |
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static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
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{ |
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ssize_t ret; |
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down_read(&minors_rwsem); |
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ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT); |
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up_read(&minors_rwsem); |
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return ret; |
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} |
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/* |
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* This function performs a Get_Report transfer over the control endpoint |
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* per section 7.2.1 of the HID specification, version 1.1. The first byte |
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* of buffer is the report number to request, or 0x0 if the device does not |
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* use numbered reports. The report_type parameter can be HID_FEATURE_REPORT |
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* or HID_INPUT_REPORT. |
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*/ |
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static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type) |
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{ |
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unsigned int minor = iminor(file_inode(file)); |
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struct hid_device *dev; |
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__u8 *buf; |
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int ret = 0, len; |
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unsigned char report_number; |
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lockdep_assert_held(&minors_rwsem); |
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if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
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ret = -ENODEV; |
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goto out; |
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} |
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dev = hidraw_table[minor]->hid; |
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if (!dev->ll_driver->raw_request) { |
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ret = -ENODEV; |
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goto out; |
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} |
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if (count > HID_MAX_BUFFER_SIZE) { |
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hid_warn(dev, "pid %d passed too large report\n", |
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task_pid_nr(current)); |
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ret = -EINVAL; |
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goto out; |
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} |
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if (count < 2) { |
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hid_warn(dev, "pid %d passed too short report\n", |
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task_pid_nr(current)); |
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ret = -EINVAL; |
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goto out; |
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} |
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buf = kmalloc(count, GFP_KERNEL); |
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if (!buf) { |
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ret = -ENOMEM; |
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goto out; |
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} |
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/* |
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* Read the first byte from the user. This is the report number, |
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* which is passed to hid_hw_raw_request(). |
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*/ |
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if (copy_from_user(&report_number, buffer, 1)) { |
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ret = -EFAULT; |
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goto out_free; |
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} |
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ret = hid_hw_raw_request(dev, report_number, buf, count, report_type, |
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HID_REQ_GET_REPORT); |
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if (ret < 0) |
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goto out_free; |
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len = (ret < count) ? ret : count; |
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if (copy_to_user(buffer, buf, len)) { |
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ret = -EFAULT; |
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goto out_free; |
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} |
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ret = len; |
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out_free: |
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kfree(buf); |
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out: |
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return ret; |
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} |
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static __poll_t hidraw_poll(struct file *file, poll_table *wait) |
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{ |
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struct hidraw_list *list = file->private_data; |
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__poll_t mask = EPOLLOUT | EPOLLWRNORM; /* hidraw is always writable */ |
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poll_wait(file, &list->hidraw->wait, wait); |
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if (list->head != list->tail) |
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mask |= EPOLLIN | EPOLLRDNORM; |
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if (!list->hidraw->exist) |
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mask |= EPOLLERR | EPOLLHUP; |
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return mask; |
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} |
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static int hidraw_open(struct inode *inode, struct file *file) |
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{ |
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unsigned int minor = iminor(inode); |
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struct hidraw *dev; |
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struct hidraw_list *list; |
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unsigned long flags; |
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int err = 0; |
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if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { |
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err = -ENOMEM; |
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goto out; |
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} |
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down_read(&minors_rwsem); |
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if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
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err = -ENODEV; |
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goto out_unlock; |
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} |
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dev = hidraw_table[minor]; |
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if (!dev->open++) { |
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err = hid_hw_power(dev->hid, PM_HINT_FULLON); |
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if (err < 0) { |
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dev->open--; |
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goto out_unlock; |
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} |
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err = hid_hw_open(dev->hid); |
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if (err < 0) { |
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hid_hw_power(dev->hid, PM_HINT_NORMAL); |
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dev->open--; |
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goto out_unlock; |
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} |
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} |
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list->hidraw = hidraw_table[minor]; |
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mutex_init(&list->read_mutex); |
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spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); |
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list_add_tail(&list->node, &hidraw_table[minor]->list); |
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spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); |
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file->private_data = list; |
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out_unlock: |
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up_read(&minors_rwsem); |
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out: |
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if (err < 0) |
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kfree(list); |
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return err; |
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} |
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static int hidraw_fasync(int fd, struct file *file, int on) |
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{ |
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struct hidraw_list *list = file->private_data; |
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return fasync_helper(fd, file, on, &list->fasync); |
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} |
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static void drop_ref(struct hidraw *hidraw, int exists_bit) |
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{ |
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if (exists_bit) { |
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hidraw->exist = 0; |
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if (hidraw->open) { |
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hid_hw_close(hidraw->hid); |
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wake_up_interruptible(&hidraw->wait); |
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} |
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device_destroy(hidraw_class, |
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MKDEV(hidraw_major, hidraw->minor)); |
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} else { |
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--hidraw->open; |
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} |
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if (!hidraw->open) { |
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if (!hidraw->exist) { |
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hidraw_table[hidraw->minor] = NULL; |
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kfree(hidraw); |
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} else { |
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/* close device for last reader */ |
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hid_hw_close(hidraw->hid); |
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hid_hw_power(hidraw->hid, PM_HINT_NORMAL); |
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} |
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} |
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} |
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static int hidraw_release(struct inode * inode, struct file * file) |
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{ |
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unsigned int minor = iminor(inode); |
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struct hidraw_list *list = file->private_data; |
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unsigned long flags; |
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down_write(&minors_rwsem); |
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spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); |
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list_del(&list->node); |
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spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); |
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kfree(list); |
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drop_ref(hidraw_table[minor], 0); |
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up_write(&minors_rwsem); |
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return 0; |
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} |
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static long hidraw_ioctl(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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struct inode *inode = file_inode(file); |
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unsigned int minor = iminor(inode); |
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long ret = 0; |
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struct hidraw *dev; |
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void __user *user_arg = (void __user*) arg; |
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down_read(&minors_rwsem); |
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dev = hidraw_table[minor]; |
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if (!dev || !dev->exist) { |
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ret = -ENODEV; |
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goto out; |
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} |
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switch (cmd) { |
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case HIDIOCGRDESCSIZE: |
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if (put_user(dev->hid->rsize, (int __user *)arg)) |
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ret = -EFAULT; |
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break; |
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|
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case HIDIOCGRDESC: |
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{ |
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__u32 len; |
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if (get_user(len, (int __user *)arg)) |
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ret = -EFAULT; |
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else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) |
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ret = -EINVAL; |
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else if (copy_to_user(user_arg + offsetof( |
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struct hidraw_report_descriptor, |
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value[0]), |
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dev->hid->rdesc, |
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min(dev->hid->rsize, len))) |
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ret = -EFAULT; |
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break; |
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} |
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case HIDIOCGRAWINFO: |
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{ |
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struct hidraw_devinfo dinfo; |
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|
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dinfo.bustype = dev->hid->bus; |
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dinfo.vendor = dev->hid->vendor; |
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dinfo.product = dev->hid->product; |
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if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) |
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ret = -EFAULT; |
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break; |
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} |
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default: |
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{ |
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struct hid_device *hid = dev->hid; |
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if (_IOC_TYPE(cmd) != 'H') { |
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ret = -EINVAL; |
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break; |
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} |
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|
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if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) { |
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int len = _IOC_SIZE(cmd); |
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ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT); |
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break; |
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} |
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if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) { |
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int len = _IOC_SIZE(cmd); |
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ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT); |
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break; |
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} |
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if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSINPUT(0))) { |
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int len = _IOC_SIZE(cmd); |
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ret = hidraw_send_report(file, user_arg, len, HID_INPUT_REPORT); |
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break; |
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} |
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if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGINPUT(0))) { |
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int len = _IOC_SIZE(cmd); |
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ret = hidraw_get_report(file, user_arg, len, HID_INPUT_REPORT); |
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break; |
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} |
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if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSOUTPUT(0))) { |
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int len = _IOC_SIZE(cmd); |
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ret = hidraw_send_report(file, user_arg, len, HID_OUTPUT_REPORT); |
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break; |
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} |
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if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGOUTPUT(0))) { |
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int len = _IOC_SIZE(cmd); |
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ret = hidraw_get_report(file, user_arg, len, HID_OUTPUT_REPORT); |
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break; |
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} |
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/* Begin Read-only ioctls. */ |
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if (_IOC_DIR(cmd) != _IOC_READ) { |
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ret = -EINVAL; |
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break; |
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} |
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if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { |
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int len = strlen(hid->name) + 1; |
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if (len > _IOC_SIZE(cmd)) |
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len = _IOC_SIZE(cmd); |
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ret = copy_to_user(user_arg, hid->name, len) ? |
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-EFAULT : len; |
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break; |
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} |
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|
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if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { |
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int len = strlen(hid->phys) + 1; |
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if (len > _IOC_SIZE(cmd)) |
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len = _IOC_SIZE(cmd); |
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ret = copy_to_user(user_arg, hid->phys, len) ? |
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-EFAULT : len; |
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break; |
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} |
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|
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if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWUNIQ(0))) { |
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int len = strlen(hid->uniq) + 1; |
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if (len > _IOC_SIZE(cmd)) |
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len = _IOC_SIZE(cmd); |
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ret = copy_to_user(user_arg, hid->uniq, len) ? |
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-EFAULT : len; |
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break; |
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} |
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} |
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|
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ret = -ENOTTY; |
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} |
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out: |
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up_read(&minors_rwsem); |
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return ret; |
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} |
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static const struct file_operations hidraw_ops = { |
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.owner = THIS_MODULE, |
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.read = hidraw_read, |
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.write = hidraw_write, |
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.poll = hidraw_poll, |
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.open = hidraw_open, |
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.release = hidraw_release, |
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.unlocked_ioctl = hidraw_ioctl, |
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.fasync = hidraw_fasync, |
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.compat_ioctl = compat_ptr_ioctl, |
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.llseek = noop_llseek, |
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}; |
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|
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int hidraw_report_event(struct hid_device *hid, u8 *data, int len) |
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{ |
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struct hidraw *dev = hid->hidraw; |
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struct hidraw_list *list; |
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int ret = 0; |
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unsigned long flags; |
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|
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spin_lock_irqsave(&dev->list_lock, flags); |
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list_for_each_entry(list, &dev->list, node) { |
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int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); |
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|
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if (new_head == list->tail) |
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continue; |
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|
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if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) { |
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ret = -ENOMEM; |
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break; |
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} |
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list->buffer[list->head].len = len; |
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list->head = new_head; |
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kill_fasync(&list->fasync, SIGIO, POLL_IN); |
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} |
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spin_unlock_irqrestore(&dev->list_lock, flags); |
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|
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wake_up_interruptible(&dev->wait); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(hidraw_report_event); |
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|
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int hidraw_connect(struct hid_device *hid) |
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{ |
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int minor, result; |
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struct hidraw *dev; |
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|
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/* we accept any HID device, all applications */ |
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|
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dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
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if (!dev) |
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return -ENOMEM; |
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|
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result = -EINVAL; |
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|
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down_write(&minors_rwsem); |
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|
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for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { |
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if (hidraw_table[minor]) |
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continue; |
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hidraw_table[minor] = dev; |
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result = 0; |
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break; |
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} |
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|
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if (result) { |
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up_write(&minors_rwsem); |
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kfree(dev); |
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goto out; |
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} |
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|
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dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor), |
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NULL, "%s%d", "hidraw", minor); |
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|
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if (IS_ERR(dev->dev)) { |
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hidraw_table[minor] = NULL; |
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up_write(&minors_rwsem); |
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result = PTR_ERR(dev->dev); |
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kfree(dev); |
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goto out; |
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} |
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|
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init_waitqueue_head(&dev->wait); |
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spin_lock_init(&dev->list_lock); |
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INIT_LIST_HEAD(&dev->list); |
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|
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dev->hid = hid; |
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dev->minor = minor; |
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|
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dev->exist = 1; |
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hid->hidraw = dev; |
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|
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up_write(&minors_rwsem); |
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out: |
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return result; |
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|
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} |
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EXPORT_SYMBOL_GPL(hidraw_connect); |
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|
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void hidraw_disconnect(struct hid_device *hid) |
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{ |
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struct hidraw *hidraw = hid->hidraw; |
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|
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down_write(&minors_rwsem); |
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|
|
drop_ref(hidraw, 1); |
|
|
|
up_write(&minors_rwsem); |
|
} |
|
EXPORT_SYMBOL_GPL(hidraw_disconnect); |
|
|
|
int __init hidraw_init(void) |
|
{ |
|
int result; |
|
dev_t dev_id; |
|
|
|
result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, |
|
HIDRAW_MAX_DEVICES, "hidraw"); |
|
if (result < 0) { |
|
pr_warn("can't get major number\n"); |
|
goto out; |
|
} |
|
|
|
hidraw_major = MAJOR(dev_id); |
|
|
|
hidraw_class = class_create(THIS_MODULE, "hidraw"); |
|
if (IS_ERR(hidraw_class)) { |
|
result = PTR_ERR(hidraw_class); |
|
goto error_cdev; |
|
} |
|
|
|
cdev_init(&hidraw_cdev, &hidraw_ops); |
|
result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); |
|
if (result < 0) |
|
goto error_class; |
|
|
|
pr_info("raw HID events driver (C) Jiri Kosina\n"); |
|
out: |
|
return result; |
|
|
|
error_class: |
|
class_destroy(hidraw_class); |
|
error_cdev: |
|
unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); |
|
goto out; |
|
} |
|
|
|
void hidraw_exit(void) |
|
{ |
|
dev_t dev_id = MKDEV(hidraw_major, 0); |
|
|
|
cdev_del(&hidraw_cdev); |
|
class_destroy(hidraw_class); |
|
unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); |
|
|
|
}
|
|
|