mirror of https://gitee.com/openkylin/linux.git
660 lines
16 KiB
C
660 lines
16 KiB
C
/*
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* f_hid.c -- USB HID function driver
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*
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* Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/utsname.h>
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#include <linux/module.h>
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#include <linux/hid.h>
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#include <linux/cdev.h>
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#include <linux/mutex.h>
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#include <linux/poll.h>
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#include <linux/uaccess.h>
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#include <linux/wait.h>
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#include <linux/usb/g_hid.h>
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static int major, minors;
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static struct class *hidg_class;
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/*-------------------------------------------------------------------------*/
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/* HID gadget struct */
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struct f_hidg {
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/* configuration */
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unsigned char bInterfaceSubClass;
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unsigned char bInterfaceProtocol;
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unsigned short report_desc_length;
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char *report_desc;
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unsigned short report_length;
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/* recv report */
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char *set_report_buff;
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unsigned short set_report_length;
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spinlock_t spinlock;
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wait_queue_head_t read_queue;
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/* send report */
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struct mutex lock;
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bool write_pending;
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wait_queue_head_t write_queue;
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struct usb_request *req;
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int minor;
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struct cdev cdev;
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struct usb_function func;
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struct usb_ep *in_ep;
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};
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static inline struct f_hidg *func_to_hidg(struct usb_function *f)
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{
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return container_of(f, struct f_hidg, func);
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}
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/*-------------------------------------------------------------------------*/
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/* Static descriptors */
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static struct usb_interface_descriptor hidg_interface_desc = {
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.bLength = sizeof hidg_interface_desc,
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.bDescriptorType = USB_DT_INTERFACE,
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/* .bInterfaceNumber = DYNAMIC */
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.bAlternateSetting = 0,
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.bNumEndpoints = 1,
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.bInterfaceClass = USB_CLASS_HID,
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/* .bInterfaceSubClass = DYNAMIC */
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/* .bInterfaceProtocol = DYNAMIC */
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/* .iInterface = DYNAMIC */
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};
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static struct hid_descriptor hidg_desc = {
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.bLength = sizeof hidg_desc,
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.bDescriptorType = HID_DT_HID,
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.bcdHID = 0x0101,
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.bCountryCode = 0x00,
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.bNumDescriptors = 0x1,
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/*.desc[0].bDescriptorType = DYNAMIC */
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/*.desc[0].wDescriptorLenght = DYNAMIC */
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};
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/* High-Speed Support */
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static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_INT,
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/*.wMaxPacketSize = DYNAMIC */
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.bInterval = 4, /* FIXME: Add this field in the
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* HID gadget configuration?
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* (struct hidg_func_descriptor)
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*/
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};
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static struct usb_descriptor_header *hidg_hs_descriptors[] = {
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(struct usb_descriptor_header *)&hidg_interface_desc,
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(struct usb_descriptor_header *)&hidg_desc,
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(struct usb_descriptor_header *)&hidg_hs_in_ep_desc,
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NULL,
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};
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/* Full-Speed Support */
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static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_INT,
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/*.wMaxPacketSize = DYNAMIC */
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.bInterval = 10, /* FIXME: Add this field in the
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* HID gadget configuration?
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* (struct hidg_func_descriptor)
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*/
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};
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static struct usb_descriptor_header *hidg_fs_descriptors[] = {
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(struct usb_descriptor_header *)&hidg_interface_desc,
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(struct usb_descriptor_header *)&hidg_desc,
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(struct usb_descriptor_header *)&hidg_fs_in_ep_desc,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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/* Char Device */
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static ssize_t f_hidg_read(struct file *file, char __user *buffer,
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size_t count, loff_t *ptr)
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{
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struct f_hidg *hidg = file->private_data;
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char *tmp_buff = NULL;
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unsigned long flags;
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if (!count)
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return 0;
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if (!access_ok(VERIFY_WRITE, buffer, count))
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return -EFAULT;
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spin_lock_irqsave(&hidg->spinlock, flags);
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#define READ_COND (hidg->set_report_buff != NULL)
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while (!READ_COND) {
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spin_unlock_irqrestore(&hidg->spinlock, flags);
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if (file->f_flags & O_NONBLOCK)
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return -EAGAIN;
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if (wait_event_interruptible(hidg->read_queue, READ_COND))
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return -ERESTARTSYS;
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spin_lock_irqsave(&hidg->spinlock, flags);
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}
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count = min_t(unsigned, count, hidg->set_report_length);
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tmp_buff = hidg->set_report_buff;
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hidg->set_report_buff = NULL;
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spin_unlock_irqrestore(&hidg->spinlock, flags);
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if (tmp_buff != NULL) {
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/* copy to user outside spinlock */
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count -= copy_to_user(buffer, tmp_buff, count);
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kfree(tmp_buff);
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} else
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count = -ENOMEM;
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return count;
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}
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static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct f_hidg *hidg = (struct f_hidg *)ep->driver_data;
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if (req->status != 0) {
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ERROR(hidg->func.config->cdev,
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"End Point Request ERROR: %d\n", req->status);
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}
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hidg->write_pending = 0;
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wake_up(&hidg->write_queue);
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}
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static ssize_t f_hidg_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *offp)
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{
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struct f_hidg *hidg = file->private_data;
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ssize_t status = -ENOMEM;
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if (!access_ok(VERIFY_READ, buffer, count))
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return -EFAULT;
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mutex_lock(&hidg->lock);
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#define WRITE_COND (!hidg->write_pending)
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/* write queue */
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while (!WRITE_COND) {
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mutex_unlock(&hidg->lock);
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if (file->f_flags & O_NONBLOCK)
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return -EAGAIN;
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if (wait_event_interruptible_exclusive(
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hidg->write_queue, WRITE_COND))
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return -ERESTARTSYS;
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mutex_lock(&hidg->lock);
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}
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count = min_t(unsigned, count, hidg->report_length);
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status = copy_from_user(hidg->req->buf, buffer, count);
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if (status != 0) {
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ERROR(hidg->func.config->cdev,
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"copy_from_user error\n");
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mutex_unlock(&hidg->lock);
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return -EINVAL;
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}
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hidg->req->status = 0;
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hidg->req->zero = 0;
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hidg->req->length = count;
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hidg->req->complete = f_hidg_req_complete;
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hidg->req->context = hidg;
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hidg->write_pending = 1;
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status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC);
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if (status < 0) {
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ERROR(hidg->func.config->cdev,
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"usb_ep_queue error on int endpoint %zd\n", status);
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hidg->write_pending = 0;
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wake_up(&hidg->write_queue);
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} else {
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status = count;
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}
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mutex_unlock(&hidg->lock);
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return status;
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}
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static unsigned int f_hidg_poll(struct file *file, poll_table *wait)
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{
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struct f_hidg *hidg = file->private_data;
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unsigned int ret = 0;
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poll_wait(file, &hidg->read_queue, wait);
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poll_wait(file, &hidg->write_queue, wait);
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if (WRITE_COND)
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ret |= POLLOUT | POLLWRNORM;
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if (READ_COND)
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ret |= POLLIN | POLLRDNORM;
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return ret;
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}
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#undef WRITE_COND
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#undef READ_COND
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static int f_hidg_release(struct inode *inode, struct file *fd)
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{
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fd->private_data = NULL;
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return 0;
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}
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static int f_hidg_open(struct inode *inode, struct file *fd)
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{
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struct f_hidg *hidg =
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container_of(inode->i_cdev, struct f_hidg, cdev);
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fd->private_data = hidg;
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return 0;
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}
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/*-------------------------------------------------------------------------*/
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/* usb_function */
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static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct f_hidg *hidg = (struct f_hidg *)req->context;
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if (req->status != 0 || req->buf == NULL || req->actual == 0) {
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ERROR(hidg->func.config->cdev, "%s FAILED\n", __func__);
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return;
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}
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spin_lock(&hidg->spinlock);
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hidg->set_report_buff = krealloc(hidg->set_report_buff,
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req->actual, GFP_ATOMIC);
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if (hidg->set_report_buff == NULL) {
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spin_unlock(&hidg->spinlock);
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return;
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}
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hidg->set_report_length = req->actual;
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memcpy(hidg->set_report_buff, req->buf, req->actual);
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spin_unlock(&hidg->spinlock);
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wake_up(&hidg->read_queue);
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}
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static int hidg_setup(struct usb_function *f,
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const struct usb_ctrlrequest *ctrl)
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{
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struct f_hidg *hidg = func_to_hidg(f);
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struct usb_composite_dev *cdev = f->config->cdev;
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struct usb_request *req = cdev->req;
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int status = 0;
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__u16 value, length;
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value = __le16_to_cpu(ctrl->wValue);
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length = __le16_to_cpu(ctrl->wLength);
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VDBG(cdev, "hid_setup crtl_request : bRequestType:0x%x bRequest:0x%x "
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"Value:0x%x\n", ctrl->bRequestType, ctrl->bRequest, value);
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switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
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case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
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| HID_REQ_GET_REPORT):
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VDBG(cdev, "get_report\n");
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/* send an empty report */
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length = min_t(unsigned, length, hidg->report_length);
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memset(req->buf, 0x0, length);
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goto respond;
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break;
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case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
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| HID_REQ_GET_PROTOCOL):
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VDBG(cdev, "get_protocol\n");
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goto stall;
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break;
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case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
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| HID_REQ_SET_REPORT):
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VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength);
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req->context = hidg;
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req->complete = hidg_set_report_complete;
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goto respond;
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break;
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case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
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| HID_REQ_SET_PROTOCOL):
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VDBG(cdev, "set_protocol\n");
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goto stall;
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break;
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case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8
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| USB_REQ_GET_DESCRIPTOR):
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switch (value >> 8) {
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case HID_DT_HID:
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VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n");
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length = min_t(unsigned short, length,
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hidg_desc.bLength);
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memcpy(req->buf, &hidg_desc, length);
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goto respond;
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break;
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case HID_DT_REPORT:
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VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n");
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length = min_t(unsigned short, length,
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hidg->report_desc_length);
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memcpy(req->buf, hidg->report_desc, length);
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goto respond;
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break;
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default:
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VDBG(cdev, "Unknown decriptor request 0x%x\n",
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value >> 8);
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goto stall;
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break;
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}
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break;
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default:
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VDBG(cdev, "Unknown request 0x%x\n",
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ctrl->bRequest);
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goto stall;
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break;
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}
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stall:
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return -EOPNOTSUPP;
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respond:
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req->zero = 0;
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req->length = length;
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status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
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if (status < 0)
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ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value);
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return status;
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}
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static void hidg_disable(struct usb_function *f)
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{
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struct f_hidg *hidg = func_to_hidg(f);
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usb_ep_disable(hidg->in_ep);
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hidg->in_ep->driver_data = NULL;
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}
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static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
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{
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struct usb_composite_dev *cdev = f->config->cdev;
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struct f_hidg *hidg = func_to_hidg(f);
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int status = 0;
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VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt);
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if (hidg->in_ep != NULL) {
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/* restart endpoint */
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if (hidg->in_ep->driver_data != NULL)
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usb_ep_disable(hidg->in_ep);
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status = config_ep_by_speed(f->config->cdev->gadget, f,
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hidg->in_ep);
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if (status) {
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ERROR(cdev, "config_ep_by_speed FAILED!\n");
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goto fail;
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}
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status = usb_ep_enable(hidg->in_ep);
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if (status < 0) {
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ERROR(cdev, "Enable endpoint FAILED!\n");
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goto fail;
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}
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hidg->in_ep->driver_data = hidg;
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}
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fail:
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return status;
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}
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const struct file_operations f_hidg_fops = {
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.owner = THIS_MODULE,
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.open = f_hidg_open,
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.release = f_hidg_release,
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.write = f_hidg_write,
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.read = f_hidg_read,
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.poll = f_hidg_poll,
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.llseek = noop_llseek,
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};
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static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f)
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{
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struct usb_ep *ep;
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struct f_hidg *hidg = func_to_hidg(f);
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int status;
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dev_t dev;
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/* allocate instance-specific interface IDs, and patch descriptors */
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status = usb_interface_id(c, f);
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if (status < 0)
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goto fail;
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hidg_interface_desc.bInterfaceNumber = status;
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/* allocate instance-specific endpoints */
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status = -ENODEV;
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ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc);
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if (!ep)
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goto fail;
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ep->driver_data = c->cdev; /* claim */
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hidg->in_ep = ep;
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/* preallocate request and buffer */
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status = -ENOMEM;
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hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL);
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if (!hidg->req)
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goto fail;
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hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL);
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if (!hidg->req->buf)
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goto fail;
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/* set descriptor dynamic values */
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hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass;
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hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol;
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hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
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hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
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hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT;
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hidg_desc.desc[0].wDescriptorLength =
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cpu_to_le16(hidg->report_desc_length);
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hidg->set_report_buff = NULL;
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/* copy descriptors */
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f->descriptors = usb_copy_descriptors(hidg_fs_descriptors);
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if (!f->descriptors)
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goto fail;
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if (gadget_is_dualspeed(c->cdev->gadget)) {
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hidg_hs_in_ep_desc.bEndpointAddress =
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hidg_fs_in_ep_desc.bEndpointAddress;
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f->hs_descriptors = usb_copy_descriptors(hidg_hs_descriptors);
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if (!f->hs_descriptors)
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goto fail;
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}
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mutex_init(&hidg->lock);
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spin_lock_init(&hidg->spinlock);
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init_waitqueue_head(&hidg->write_queue);
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init_waitqueue_head(&hidg->read_queue);
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/* create char device */
|
|
cdev_init(&hidg->cdev, &f_hidg_fops);
|
|
dev = MKDEV(major, hidg->minor);
|
|
status = cdev_add(&hidg->cdev, dev, 1);
|
|
if (status)
|
|
goto fail;
|
|
|
|
device_create(hidg_class, NULL, dev, NULL, "%s%d", "hidg", hidg->minor);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
ERROR(f->config->cdev, "hidg_bind FAILED\n");
|
|
if (hidg->req != NULL) {
|
|
kfree(hidg->req->buf);
|
|
if (hidg->in_ep != NULL)
|
|
usb_ep_free_request(hidg->in_ep, hidg->req);
|
|
}
|
|
|
|
usb_free_descriptors(f->hs_descriptors);
|
|
usb_free_descriptors(f->descriptors);
|
|
|
|
return status;
|
|
}
|
|
|
|
static void hidg_unbind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct f_hidg *hidg = func_to_hidg(f);
|
|
|
|
device_destroy(hidg_class, MKDEV(major, hidg->minor));
|
|
cdev_del(&hidg->cdev);
|
|
|
|
/* disable/free request and end point */
|
|
usb_ep_disable(hidg->in_ep);
|
|
usb_ep_dequeue(hidg->in_ep, hidg->req);
|
|
kfree(hidg->req->buf);
|
|
usb_ep_free_request(hidg->in_ep, hidg->req);
|
|
|
|
/* free descriptors copies */
|
|
usb_free_descriptors(f->hs_descriptors);
|
|
usb_free_descriptors(f->descriptors);
|
|
|
|
kfree(hidg->report_desc);
|
|
kfree(hidg->set_report_buff);
|
|
kfree(hidg);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
/* Strings */
|
|
|
|
#define CT_FUNC_HID_IDX 0
|
|
|
|
static struct usb_string ct_func_string_defs[] = {
|
|
[CT_FUNC_HID_IDX].s = "HID Interface",
|
|
{}, /* end of list */
|
|
};
|
|
|
|
static struct usb_gadget_strings ct_func_string_table = {
|
|
.language = 0x0409, /* en-US */
|
|
.strings = ct_func_string_defs,
|
|
};
|
|
|
|
static struct usb_gadget_strings *ct_func_strings[] = {
|
|
&ct_func_string_table,
|
|
NULL,
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
/* usb_configuration */
|
|
|
|
int __init hidg_bind_config(struct usb_configuration *c,
|
|
struct hidg_func_descriptor *fdesc, int index)
|
|
{
|
|
struct f_hidg *hidg;
|
|
int status;
|
|
|
|
if (index >= minors)
|
|
return -ENOENT;
|
|
|
|
/* maybe allocate device-global string IDs, and patch descriptors */
|
|
if (ct_func_string_defs[CT_FUNC_HID_IDX].id == 0) {
|
|
status = usb_string_id(c->cdev);
|
|
if (status < 0)
|
|
return status;
|
|
ct_func_string_defs[CT_FUNC_HID_IDX].id = status;
|
|
hidg_interface_desc.iInterface = status;
|
|
}
|
|
|
|
/* allocate and initialize one new instance */
|
|
hidg = kzalloc(sizeof *hidg, GFP_KERNEL);
|
|
if (!hidg)
|
|
return -ENOMEM;
|
|
|
|
hidg->minor = index;
|
|
hidg->bInterfaceSubClass = fdesc->subclass;
|
|
hidg->bInterfaceProtocol = fdesc->protocol;
|
|
hidg->report_length = fdesc->report_length;
|
|
hidg->report_desc_length = fdesc->report_desc_length;
|
|
hidg->report_desc = kmemdup(fdesc->report_desc,
|
|
fdesc->report_desc_length,
|
|
GFP_KERNEL);
|
|
if (!hidg->report_desc) {
|
|
kfree(hidg);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
hidg->func.name = "hid";
|
|
hidg->func.strings = ct_func_strings;
|
|
hidg->func.bind = hidg_bind;
|
|
hidg->func.unbind = hidg_unbind;
|
|
hidg->func.set_alt = hidg_set_alt;
|
|
hidg->func.disable = hidg_disable;
|
|
hidg->func.setup = hidg_setup;
|
|
|
|
status = usb_add_function(c, &hidg->func);
|
|
if (status)
|
|
kfree(hidg);
|
|
|
|
return status;
|
|
}
|
|
|
|
int __init ghid_setup(struct usb_gadget *g, int count)
|
|
{
|
|
int status;
|
|
dev_t dev;
|
|
|
|
hidg_class = class_create(THIS_MODULE, "hidg");
|
|
|
|
status = alloc_chrdev_region(&dev, 0, count, "hidg");
|
|
if (!status) {
|
|
major = MAJOR(dev);
|
|
minors = count;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
void ghid_cleanup(void)
|
|
{
|
|
if (major) {
|
|
unregister_chrdev_region(MKDEV(major, 0), minors);
|
|
major = minors = 0;
|
|
}
|
|
|
|
class_destroy(hidg_class);
|
|
hidg_class = NULL;
|
|
}
|