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@@ -0,0 +1,673 @@
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+/*
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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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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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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/smp_lock.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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+
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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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+/*-------------------------------------------------------------------------*/
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+/* HID gadget struct */
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+
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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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+
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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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+
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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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+
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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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+ struct usb_endpoint_descriptor *fs_in_ep_desc;
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+ struct usb_endpoint_descriptor *hs_in_ep_desc;
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+};
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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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+/*-------------------------------------------------------------------------*/
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+/* Static descriptors */
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+
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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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+
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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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+
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+/* High-Speed Support */
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+
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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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+
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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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+
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+/* Full-Speed Support */
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+
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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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+
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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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+/*-------------------------------------------------------------------------*/
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+/* Char Device */
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+
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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 = (struct f_hidg *)file->private_data;
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+ char *tmp_buff = NULL;
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+ unsigned long flags;
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+
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+ if (!count)
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+ return 0;
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+
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+ if (!access_ok(VERIFY_WRITE, buffer, count))
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+ return -EFAULT;
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+
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+ spin_lock_irqsave(&hidg->spinlock, flags);
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+
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+#define READ_COND (hidg->set_report_buff != NULL)
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+
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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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+
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+ if (wait_event_interruptible(hidg->read_queue, READ_COND))
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+ return -ERESTARTSYS;
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+
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+ spin_lock_irqsave(&hidg->spinlock, flags);
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+ }
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+
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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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+
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+ spin_unlock_irqrestore(&hidg->spinlock, flags);
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+
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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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+
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+ return count;
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+}
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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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+
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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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+
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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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+
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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 = (struct f_hidg *)file->private_data;
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+ ssize_t status = -ENOMEM;
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+
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+ if (!access_ok(VERIFY_READ, buffer, count))
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+ return -EFAULT;
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+
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+ mutex_lock(&hidg->lock);
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+
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+#define WRITE_COND (!hidg->write_pending)
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+
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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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+
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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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+
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+ mutex_lock(&hidg->lock);
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+ }
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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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+
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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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+
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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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+
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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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+
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+ mutex_unlock(&hidg->lock);
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+
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+ return status;
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+}
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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 = (struct f_hidg *)file->private_data;
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+ unsigned int ret = 0;
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+
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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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+
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+ if (WRITE_COND)
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+ ret |= POLLOUT | POLLWRNORM;
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+
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+ if (READ_COND)
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+ ret |= POLLIN | POLLRDNORM;
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+
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+ return ret;
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+}
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+
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+#undef WRITE_COND
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+#undef READ_COND
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+
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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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+
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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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+
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+ fd->private_data = hidg;
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+
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+ return 0;
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+}
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+
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+/*-------------------------------------------------------------------------*/
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+/* usb_function */
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+
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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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+
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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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+
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+ spin_lock(&hidg->spinlock);
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+
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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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+
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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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+
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+ spin_unlock(&hidg->spinlock);
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+
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+ wake_up(&hidg->read_queue);
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+
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+ return;
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+}
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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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+
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+ value = __le16_to_cpu(ctrl->wValue);
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+ length = __le16_to_cpu(ctrl->wLength);
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+
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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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+
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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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+
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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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+
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+ goto respond;
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+ break;
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+
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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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+
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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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+
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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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+
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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_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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+
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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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+
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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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+
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+stall:
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+ return -EOPNOTSUPP;
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+
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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)
|
|
|
+{
|
|
|
+ struct f_hidg *hidg = func_to_hidg(f);
|
|
|
+
|
|
|
+ usb_ep_disable(hidg->in_ep);
|
|
|
+ hidg->in_ep->driver_data = NULL;
|
|
|
+
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
|
|
|
+{
|
|
|
+ struct usb_composite_dev *cdev = f->config->cdev;
|
|
|
+ struct f_hidg *hidg = func_to_hidg(f);
|
|
|
+ const struct usb_endpoint_descriptor *ep_desc;
|
|
|
+ int status = 0;
|
|
|
+
|
|
|
+ VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt);
|
|
|
+
|
|
|
+ if (hidg->in_ep != NULL) {
|
|
|
+ /* restart endpoint */
|
|
|
+ if (hidg->in_ep->driver_data != NULL)
|
|
|
+ usb_ep_disable(hidg->in_ep);
|
|
|
+
|
|
|
+ ep_desc = ep_choose(f->config->cdev->gadget,
|
|
|
+ hidg->hs_in_ep_desc, hidg->fs_in_ep_desc);
|
|
|
+ status = usb_ep_enable(hidg->in_ep, ep_desc);
|
|
|
+ if (status < 0) {
|
|
|
+ ERROR(cdev, "Enable endpoint FAILED!\n");
|
|
|
+ goto fail;
|
|
|
+ }
|
|
|
+ hidg->in_ep->driver_data = hidg;
|
|
|
+ }
|
|
|
+fail:
|
|
|
+ return status;
|
|
|
+}
|
|
|
+
|
|
|
+const struct file_operations f_hidg_fops = {
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+ .open = f_hidg_open,
|
|
|
+ .release = f_hidg_release,
|
|
|
+ .write = f_hidg_write,
|
|
|
+ .read = f_hidg_read,
|
|
|
+ .poll = f_hidg_poll,
|
|
|
+};
|
|
|
+
|
|
|
+static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f)
|
|
|
+{
|
|
|
+ struct usb_ep *ep;
|
|
|
+ struct f_hidg *hidg = func_to_hidg(f);
|
|
|
+ int status;
|
|
|
+ dev_t dev;
|
|
|
+
|
|
|
+ /* allocate instance-specific interface IDs, and patch descriptors */
|
|
|
+ status = usb_interface_id(c, f);
|
|
|
+ if (status < 0)
|
|
|
+ goto fail;
|
|
|
+ hidg_interface_desc.bInterfaceNumber = status;
|
|
|
+
|
|
|
+
|
|
|
+ /* allocate instance-specific endpoints */
|
|
|
+ status = -ENODEV;
|
|
|
+ ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc);
|
|
|
+ if (!ep)
|
|
|
+ goto fail;
|
|
|
+ ep->driver_data = c->cdev; /* claim */
|
|
|
+ hidg->in_ep = ep;
|
|
|
+
|
|
|
+ /* preallocate request and buffer */
|
|
|
+ status = -ENOMEM;
|
|
|
+ hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL);
|
|
|
+ if (!hidg->req)
|
|
|
+ goto fail;
|
|
|
+
|
|
|
+
|
|
|
+ hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL);
|
|
|
+ if (!hidg->req->buf)
|
|
|
+ goto fail;
|
|
|
+
|
|
|
+ /* set descriptor dynamic values */
|
|
|
+ hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass;
|
|
|
+ hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol;
|
|
|
+ hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
|
|
|
+ hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
|
|
|
+ hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT;
|
|
|
+ hidg_desc.desc[0].wDescriptorLength =
|
|
|
+ cpu_to_le16(hidg->report_desc_length);
|
|
|
+
|
|
|
+ hidg->set_report_buff = NULL;
|
|
|
+
|
|
|
+ /* copy descriptors */
|
|
|
+ f->descriptors = usb_copy_descriptors(hidg_fs_descriptors);
|
|
|
+ if (!f->descriptors)
|
|
|
+ goto fail;
|
|
|
+
|
|
|
+ hidg->fs_in_ep_desc = usb_find_endpoint(hidg_fs_descriptors,
|
|
|
+ f->descriptors,
|
|
|
+ &hidg_fs_in_ep_desc);
|
|
|
+
|
|
|
+ if (gadget_is_dualspeed(c->cdev->gadget)) {
|
|
|
+ hidg_hs_in_ep_desc.bEndpointAddress =
|
|
|
+ hidg_fs_in_ep_desc.bEndpointAddress;
|
|
|
+ f->hs_descriptors = usb_copy_descriptors(hidg_hs_descriptors);
|
|
|
+ if (!f->hs_descriptors)
|
|
|
+ goto fail;
|
|
|
+ hidg->hs_in_ep_desc = usb_find_endpoint(hidg_hs_descriptors,
|
|
|
+ f->hs_descriptors,
|
|
|
+ &hidg_hs_in_ep_desc);
|
|
|
+ } else {
|
|
|
+ hidg->hs_in_ep_desc = NULL;
|
|
|
+ }
|
|
|
+
|
|
|
+ mutex_init(&hidg->lock);
|
|
|
+ spin_lock_init(&hidg->spinlock);
|
|
|
+ init_waitqueue_head(&hidg->write_queue);
|
|
|
+ init_waitqueue_head(&hidg->read_queue);
|
|
|
+
|
|
|
+ /* 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;
|
|
|
+}
|
Fabien Chouteau