1171 строка
29 KiB
C
1171 строка
29 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/hid.h>
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#include <linux/idr.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/sched.h>
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#include <linux/usb/g_hid.h>
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#include "u_f.h"
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#include "u_hid.h"
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#define HIDG_MINORS 4
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static int major, minors;
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static struct class *hidg_class;
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static DEFINE_IDA(hidg_ida);
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static DEFINE_MUTEX(hidg_ida_lock); /* protects access to hidg_ida */
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/*-------------------------------------------------------------------------*/
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/* HID gadget struct */
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struct f_hidg_req_list {
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struct usb_request *req;
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unsigned int pos;
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struct list_head list;
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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 char protocol;
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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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struct list_head completed_out_req;
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spinlock_t read_spinlock;
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wait_queue_head_t read_queue;
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unsigned int qlen;
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/* send report */
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spinlock_t write_spinlock;
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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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struct usb_ep *out_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 = 2,
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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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/* Super-Speed Support */
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static struct usb_endpoint_descriptor hidg_ss_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_ss_ep_comp_descriptor hidg_ss_in_comp_desc = {
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.bLength = sizeof(hidg_ss_in_comp_desc),
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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/* .bMaxBurst = 0, */
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/* .bmAttributes = 0, */
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/* .wBytesPerInterval = DYNAMIC */
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};
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static struct usb_endpoint_descriptor hidg_ss_out_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_OUT,
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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_ss_ep_comp_descriptor hidg_ss_out_comp_desc = {
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.bLength = sizeof(hidg_ss_out_comp_desc),
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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/* .bMaxBurst = 0, */
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/* .bmAttributes = 0, */
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/* .wBytesPerInterval = DYNAMIC */
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};
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static struct usb_descriptor_header *hidg_ss_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_ss_in_ep_desc,
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(struct usb_descriptor_header *)&hidg_ss_in_comp_desc,
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(struct usb_descriptor_header *)&hidg_ss_out_ep_desc,
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(struct usb_descriptor_header *)&hidg_ss_out_comp_desc,
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NULL,
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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_endpoint_descriptor hidg_hs_out_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_OUT,
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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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(struct usb_descriptor_header *)&hidg_hs_out_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_endpoint_descriptor hidg_fs_out_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_OUT,
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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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(struct usb_descriptor_header *)&hidg_fs_out_ep_desc,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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/* Strings */
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#define CT_FUNC_HID_IDX 0
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static struct usb_string ct_func_string_defs[] = {
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[CT_FUNC_HID_IDX].s = "HID Interface",
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{}, /* end of list */
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};
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static struct usb_gadget_strings ct_func_string_table = {
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.language = 0x0409, /* en-US */
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.strings = ct_func_string_defs,
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};
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static struct usb_gadget_strings *ct_func_strings[] = {
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&ct_func_string_table,
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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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struct f_hidg_req_list *list;
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struct usb_request *req;
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unsigned long flags;
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int ret;
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if (!count)
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return 0;
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if (!access_ok(buffer, count))
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return -EFAULT;
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spin_lock_irqsave(&hidg->read_spinlock, flags);
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#define READ_COND (!list_empty(&hidg->completed_out_req))
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/* wait for at least one buffer to complete */
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while (!READ_COND) {
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spin_unlock_irqrestore(&hidg->read_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->read_spinlock, flags);
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}
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/* pick the first one */
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list = list_first_entry(&hidg->completed_out_req,
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struct f_hidg_req_list, list);
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/*
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* Remove this from list to protect it from beign free()
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* while host disables our function
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*/
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list_del(&list->list);
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req = list->req;
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count = min_t(unsigned int, count, req->actual - list->pos);
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spin_unlock_irqrestore(&hidg->read_spinlock, flags);
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/* copy to user outside spinlock */
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count -= copy_to_user(buffer, req->buf + list->pos, count);
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list->pos += count;
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/*
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* if this request is completely handled and transfered to
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* userspace, remove its entry from the list and requeue it
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* again. Otherwise, we will revisit it again upon the next
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* call, taking into account its current read position.
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*/
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if (list->pos == req->actual) {
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kfree(list);
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req->length = hidg->report_length;
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ret = usb_ep_queue(hidg->out_ep, req, GFP_KERNEL);
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if (ret < 0) {
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free_ep_req(hidg->out_ep, req);
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return ret;
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}
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} else {
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spin_lock_irqsave(&hidg->read_spinlock, flags);
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list_add(&list->list, &hidg->completed_out_req);
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spin_unlock_irqrestore(&hidg->read_spinlock, flags);
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wake_up(&hidg->read_queue);
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}
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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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unsigned long flags;
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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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spin_lock_irqsave(&hidg->write_spinlock, flags);
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hidg->write_pending = 0;
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spin_unlock_irqrestore(&hidg->write_spinlock, flags);
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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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struct usb_request *req;
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unsigned long flags;
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ssize_t status = -ENOMEM;
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if (!access_ok(buffer, count))
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return -EFAULT;
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spin_lock_irqsave(&hidg->write_spinlock, flags);
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#define WRITE_COND (!hidg->write_pending)
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try_again:
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/* write queue */
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while (!WRITE_COND) {
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spin_unlock_irqrestore(&hidg->write_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_exclusive(
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hidg->write_queue, WRITE_COND))
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return -ERESTARTSYS;
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spin_lock_irqsave(&hidg->write_spinlock, flags);
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}
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hidg->write_pending = 1;
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req = hidg->req;
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count = min_t(unsigned, count, hidg->report_length);
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spin_unlock_irqrestore(&hidg->write_spinlock, flags);
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status = copy_from_user(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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status = -EINVAL;
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goto release_write_pending;
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}
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spin_lock_irqsave(&hidg->write_spinlock, flags);
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/* when our function has been disabled by host */
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if (!hidg->req) {
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free_ep_req(hidg->in_ep, req);
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/*
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* TODO
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* Should we fail with error here?
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*/
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goto try_again;
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}
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req->status = 0;
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req->zero = 0;
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req->length = count;
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req->complete = f_hidg_req_complete;
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req->context = hidg;
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spin_unlock_irqrestore(&hidg->write_spinlock, flags);
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status = usb_ep_queue(hidg->in_ep, 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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goto release_write_pending;
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} else {
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status = count;
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}
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return status;
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release_write_pending:
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spin_lock_irqsave(&hidg->write_spinlock, flags);
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hidg->write_pending = 0;
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spin_unlock_irqrestore(&hidg->write_spinlock, flags);
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wake_up(&hidg->write_queue);
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return status;
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}
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static __poll_t 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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__poll_t 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 |= EPOLLOUT | EPOLLWRNORM;
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if (READ_COND)
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ret |= EPOLLIN | EPOLLRDNORM;
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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 inline struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep,
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unsigned length)
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{
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return alloc_ep_req(ep, length);
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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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struct usb_composite_dev *cdev = hidg->func.config->cdev;
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struct f_hidg_req_list *req_list;
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unsigned long flags;
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switch (req->status) {
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case 0:
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req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC);
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if (!req_list) {
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ERROR(cdev, "Unable to allocate mem for req_list\n");
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goto free_req;
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}
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req_list->req = req;
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spin_lock_irqsave(&hidg->read_spinlock, flags);
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list_add_tail(&req_list->list, &hidg->completed_out_req);
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spin_unlock_irqrestore(&hidg->read_spinlock, flags);
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wake_up(&hidg->read_queue);
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break;
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default:
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ERROR(cdev, "Set report failed %d\n", req->status);
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/* FALLTHROUGH */
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case -ECONNABORTED: /* hardware forced ep reset */
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case -ECONNRESET: /* request dequeued */
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case -ESHUTDOWN: /* disconnect from host */
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free_req:
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free_ep_req(ep, req);
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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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value = __le16_to_cpu(ctrl->wValue);
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length = __le16_to_cpu(ctrl->wLength);
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VDBG(cdev,
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"%s crtl_request : bRequestType:0x%x bRequest:0x%x Value:0x%x\n",
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__func__, 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
|
|
| HID_REQ_GET_REPORT):
|
|
VDBG(cdev, "get_report\n");
|
|
|
|
/* send an empty report */
|
|
length = min_t(unsigned, length, hidg->report_length);
|
|
memset(req->buf, 0x0, length);
|
|
|
|
goto respond;
|
|
break;
|
|
|
|
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
|
|
| HID_REQ_GET_PROTOCOL):
|
|
VDBG(cdev, "get_protocol\n");
|
|
length = min_t(unsigned int, length, 1);
|
|
((u8 *) req->buf)[0] = hidg->protocol;
|
|
goto respond;
|
|
break;
|
|
|
|
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
|
|
| HID_REQ_SET_REPORT):
|
|
VDBG(cdev, "set_report | wLength=%d\n", ctrl->wLength);
|
|
goto stall;
|
|
break;
|
|
|
|
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
|
|
| HID_REQ_SET_PROTOCOL):
|
|
VDBG(cdev, "set_protocol\n");
|
|
if (value > HID_REPORT_PROTOCOL)
|
|
goto stall;
|
|
length = 0;
|
|
/*
|
|
* We assume that programs implementing the Boot protocol
|
|
* are also compatible with the Report Protocol
|
|
*/
|
|
if (hidg->bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
|
|
hidg->protocol = value;
|
|
goto respond;
|
|
}
|
|
goto stall;
|
|
break;
|
|
|
|
case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8
|
|
| USB_REQ_GET_DESCRIPTOR):
|
|
switch (value >> 8) {
|
|
case HID_DT_HID:
|
|
{
|
|
struct hid_descriptor hidg_desc_copy = hidg_desc;
|
|
|
|
VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n");
|
|
hidg_desc_copy.desc[0].bDescriptorType = HID_DT_REPORT;
|
|
hidg_desc_copy.desc[0].wDescriptorLength =
|
|
cpu_to_le16(hidg->report_desc_length);
|
|
|
|
length = min_t(unsigned short, length,
|
|
hidg_desc_copy.bLength);
|
|
memcpy(req->buf, &hidg_desc_copy, length);
|
|
goto respond;
|
|
break;
|
|
}
|
|
case HID_DT_REPORT:
|
|
VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n");
|
|
length = min_t(unsigned short, length,
|
|
hidg->report_desc_length);
|
|
memcpy(req->buf, hidg->report_desc, length);
|
|
goto respond;
|
|
break;
|
|
|
|
default:
|
|
VDBG(cdev, "Unknown descriptor request 0x%x\n",
|
|
value >> 8);
|
|
goto stall;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
VDBG(cdev, "Unknown request 0x%x\n",
|
|
ctrl->bRequest);
|
|
goto stall;
|
|
break;
|
|
}
|
|
|
|
stall:
|
|
return -EOPNOTSUPP;
|
|
|
|
respond:
|
|
req->zero = 0;
|
|
req->length = length;
|
|
status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
|
|
if (status < 0)
|
|
ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value);
|
|
return status;
|
|
}
|
|
|
|
static void hidg_disable(struct usb_function *f)
|
|
{
|
|
struct f_hidg *hidg = func_to_hidg(f);
|
|
struct f_hidg_req_list *list, *next;
|
|
unsigned long flags;
|
|
|
|
usb_ep_disable(hidg->in_ep);
|
|
usb_ep_disable(hidg->out_ep);
|
|
|
|
spin_lock_irqsave(&hidg->read_spinlock, flags);
|
|
list_for_each_entry_safe(list, next, &hidg->completed_out_req, list) {
|
|
free_ep_req(hidg->out_ep, list->req);
|
|
list_del(&list->list);
|
|
kfree(list);
|
|
}
|
|
spin_unlock_irqrestore(&hidg->read_spinlock, flags);
|
|
|
|
spin_lock_irqsave(&hidg->write_spinlock, flags);
|
|
if (!hidg->write_pending) {
|
|
free_ep_req(hidg->in_ep, hidg->req);
|
|
hidg->write_pending = 1;
|
|
}
|
|
|
|
hidg->req = NULL;
|
|
spin_unlock_irqrestore(&hidg->write_spinlock, flags);
|
|
}
|
|
|
|
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);
|
|
struct usb_request *req_in = NULL;
|
|
unsigned long flags;
|
|
int i, status = 0;
|
|
|
|
VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt);
|
|
|
|
if (hidg->in_ep != NULL) {
|
|
/* restart endpoint */
|
|
usb_ep_disable(hidg->in_ep);
|
|
|
|
status = config_ep_by_speed(f->config->cdev->gadget, f,
|
|
hidg->in_ep);
|
|
if (status) {
|
|
ERROR(cdev, "config_ep_by_speed FAILED!\n");
|
|
goto fail;
|
|
}
|
|
status = usb_ep_enable(hidg->in_ep);
|
|
if (status < 0) {
|
|
ERROR(cdev, "Enable IN endpoint FAILED!\n");
|
|
goto fail;
|
|
}
|
|
hidg->in_ep->driver_data = hidg;
|
|
|
|
req_in = hidg_alloc_ep_req(hidg->in_ep, hidg->report_length);
|
|
if (!req_in) {
|
|
status = -ENOMEM;
|
|
goto disable_ep_in;
|
|
}
|
|
}
|
|
|
|
|
|
if (hidg->out_ep != NULL) {
|
|
/* restart endpoint */
|
|
usb_ep_disable(hidg->out_ep);
|
|
|
|
status = config_ep_by_speed(f->config->cdev->gadget, f,
|
|
hidg->out_ep);
|
|
if (status) {
|
|
ERROR(cdev, "config_ep_by_speed FAILED!\n");
|
|
goto free_req_in;
|
|
}
|
|
status = usb_ep_enable(hidg->out_ep);
|
|
if (status < 0) {
|
|
ERROR(cdev, "Enable OUT endpoint FAILED!\n");
|
|
goto free_req_in;
|
|
}
|
|
hidg->out_ep->driver_data = hidg;
|
|
|
|
/*
|
|
* allocate a bunch of read buffers and queue them all at once.
|
|
*/
|
|
for (i = 0; i < hidg->qlen && status == 0; i++) {
|
|
struct usb_request *req =
|
|
hidg_alloc_ep_req(hidg->out_ep,
|
|
hidg->report_length);
|
|
if (req) {
|
|
req->complete = hidg_set_report_complete;
|
|
req->context = hidg;
|
|
status = usb_ep_queue(hidg->out_ep, req,
|
|
GFP_ATOMIC);
|
|
if (status) {
|
|
ERROR(cdev, "%s queue req --> %d\n",
|
|
hidg->out_ep->name, status);
|
|
free_ep_req(hidg->out_ep, req);
|
|
}
|
|
} else {
|
|
status = -ENOMEM;
|
|
goto disable_out_ep;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (hidg->in_ep != NULL) {
|
|
spin_lock_irqsave(&hidg->write_spinlock, flags);
|
|
hidg->req = req_in;
|
|
hidg->write_pending = 0;
|
|
spin_unlock_irqrestore(&hidg->write_spinlock, flags);
|
|
|
|
wake_up(&hidg->write_queue);
|
|
}
|
|
return 0;
|
|
disable_out_ep:
|
|
usb_ep_disable(hidg->out_ep);
|
|
free_req_in:
|
|
if (req_in)
|
|
free_ep_req(hidg->in_ep, req_in);
|
|
|
|
disable_ep_in:
|
|
if (hidg->in_ep)
|
|
usb_ep_disable(hidg->in_ep);
|
|
|
|
fail:
|
|
return status;
|
|
}
|
|
|
|
static 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,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static int hidg_bind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct usb_ep *ep;
|
|
struct f_hidg *hidg = func_to_hidg(f);
|
|
struct usb_string *us;
|
|
struct device *device;
|
|
int status;
|
|
dev_t dev;
|
|
|
|
/* maybe allocate device-global string IDs, and patch descriptors */
|
|
us = usb_gstrings_attach(c->cdev, ct_func_strings,
|
|
ARRAY_SIZE(ct_func_string_defs));
|
|
if (IS_ERR(us))
|
|
return PTR_ERR(us);
|
|
hidg_interface_desc.iInterface = us[CT_FUNC_HID_IDX].id;
|
|
|
|
/* 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;
|
|
hidg->in_ep = ep;
|
|
|
|
ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_out_ep_desc);
|
|
if (!ep)
|
|
goto fail;
|
|
hidg->out_ep = ep;
|
|
|
|
/* set descriptor dynamic values */
|
|
hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass;
|
|
hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol;
|
|
hidg->protocol = HID_REPORT_PROTOCOL;
|
|
hidg_ss_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
|
|
hidg_ss_in_comp_desc.wBytesPerInterval =
|
|
cpu_to_le16(hidg->report_length);
|
|
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_ss_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
|
|
hidg_ss_out_comp_desc.wBytesPerInterval =
|
|
cpu_to_le16(hidg->report_length);
|
|
hidg_hs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
|
|
hidg_fs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
|
|
/*
|
|
* We can use hidg_desc struct here but we should not relay
|
|
* that its content won't change after returning from this function.
|
|
*/
|
|
hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT;
|
|
hidg_desc.desc[0].wDescriptorLength =
|
|
cpu_to_le16(hidg->report_desc_length);
|
|
|
|
hidg_hs_in_ep_desc.bEndpointAddress =
|
|
hidg_fs_in_ep_desc.bEndpointAddress;
|
|
hidg_hs_out_ep_desc.bEndpointAddress =
|
|
hidg_fs_out_ep_desc.bEndpointAddress;
|
|
|
|
hidg_ss_in_ep_desc.bEndpointAddress =
|
|
hidg_fs_in_ep_desc.bEndpointAddress;
|
|
hidg_ss_out_ep_desc.bEndpointAddress =
|
|
hidg_fs_out_ep_desc.bEndpointAddress;
|
|
|
|
status = usb_assign_descriptors(f, hidg_fs_descriptors,
|
|
hidg_hs_descriptors, hidg_ss_descriptors, NULL);
|
|
if (status)
|
|
goto fail;
|
|
|
|
spin_lock_init(&hidg->write_spinlock);
|
|
hidg->write_pending = 1;
|
|
hidg->req = NULL;
|
|
spin_lock_init(&hidg->read_spinlock);
|
|
init_waitqueue_head(&hidg->write_queue);
|
|
init_waitqueue_head(&hidg->read_queue);
|
|
INIT_LIST_HEAD(&hidg->completed_out_req);
|
|
|
|
/* 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_free_descs;
|
|
|
|
device = device_create(hidg_class, NULL, dev, NULL,
|
|
"%s%d", "hidg", hidg->minor);
|
|
if (IS_ERR(device)) {
|
|
status = PTR_ERR(device);
|
|
goto del;
|
|
}
|
|
|
|
return 0;
|
|
del:
|
|
cdev_del(&hidg->cdev);
|
|
fail_free_descs:
|
|
usb_free_all_descriptors(f);
|
|
fail:
|
|
ERROR(f->config->cdev, "hidg_bind FAILED\n");
|
|
if (hidg->req != NULL)
|
|
free_ep_req(hidg->in_ep, hidg->req);
|
|
|
|
return status;
|
|
}
|
|
|
|
static inline int hidg_get_minor(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = ida_simple_get(&hidg_ida, 0, 0, GFP_KERNEL);
|
|
if (ret >= HIDG_MINORS) {
|
|
ida_simple_remove(&hidg_ida, ret);
|
|
ret = -ENODEV;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline struct f_hid_opts *to_f_hid_opts(struct config_item *item)
|
|
{
|
|
return container_of(to_config_group(item), struct f_hid_opts,
|
|
func_inst.group);
|
|
}
|
|
|
|
static void hid_attr_release(struct config_item *item)
|
|
{
|
|
struct f_hid_opts *opts = to_f_hid_opts(item);
|
|
|
|
usb_put_function_instance(&opts->func_inst);
|
|
}
|
|
|
|
static struct configfs_item_operations hidg_item_ops = {
|
|
.release = hid_attr_release,
|
|
};
|
|
|
|
#define F_HID_OPT(name, prec, limit) \
|
|
static ssize_t f_hid_opts_##name##_show(struct config_item *item, char *page)\
|
|
{ \
|
|
struct f_hid_opts *opts = to_f_hid_opts(item); \
|
|
int result; \
|
|
\
|
|
mutex_lock(&opts->lock); \
|
|
result = sprintf(page, "%d\n", opts->name); \
|
|
mutex_unlock(&opts->lock); \
|
|
\
|
|
return result; \
|
|
} \
|
|
\
|
|
static ssize_t f_hid_opts_##name##_store(struct config_item *item, \
|
|
const char *page, size_t len) \
|
|
{ \
|
|
struct f_hid_opts *opts = to_f_hid_opts(item); \
|
|
int ret; \
|
|
u##prec num; \
|
|
\
|
|
mutex_lock(&opts->lock); \
|
|
if (opts->refcnt) { \
|
|
ret = -EBUSY; \
|
|
goto end; \
|
|
} \
|
|
\
|
|
ret = kstrtou##prec(page, 0, &num); \
|
|
if (ret) \
|
|
goto end; \
|
|
\
|
|
if (num > limit) { \
|
|
ret = -EINVAL; \
|
|
goto end; \
|
|
} \
|
|
opts->name = num; \
|
|
ret = len; \
|
|
\
|
|
end: \
|
|
mutex_unlock(&opts->lock); \
|
|
return ret; \
|
|
} \
|
|
\
|
|
CONFIGFS_ATTR(f_hid_opts_, name)
|
|
|
|
F_HID_OPT(subclass, 8, 255);
|
|
F_HID_OPT(protocol, 8, 255);
|
|
F_HID_OPT(report_length, 16, 65535);
|
|
|
|
static ssize_t f_hid_opts_report_desc_show(struct config_item *item, char *page)
|
|
{
|
|
struct f_hid_opts *opts = to_f_hid_opts(item);
|
|
int result;
|
|
|
|
mutex_lock(&opts->lock);
|
|
result = opts->report_desc_length;
|
|
memcpy(page, opts->report_desc, opts->report_desc_length);
|
|
mutex_unlock(&opts->lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
static ssize_t f_hid_opts_report_desc_store(struct config_item *item,
|
|
const char *page, size_t len)
|
|
{
|
|
struct f_hid_opts *opts = to_f_hid_opts(item);
|
|
int ret = -EBUSY;
|
|
char *d;
|
|
|
|
mutex_lock(&opts->lock);
|
|
|
|
if (opts->refcnt)
|
|
goto end;
|
|
if (len > PAGE_SIZE) {
|
|
ret = -ENOSPC;
|
|
goto end;
|
|
}
|
|
d = kmemdup(page, len, GFP_KERNEL);
|
|
if (!d) {
|
|
ret = -ENOMEM;
|
|
goto end;
|
|
}
|
|
kfree(opts->report_desc);
|
|
opts->report_desc = d;
|
|
opts->report_desc_length = len;
|
|
opts->report_desc_alloc = true;
|
|
ret = len;
|
|
end:
|
|
mutex_unlock(&opts->lock);
|
|
return ret;
|
|
}
|
|
|
|
CONFIGFS_ATTR(f_hid_opts_, report_desc);
|
|
|
|
static ssize_t f_hid_opts_dev_show(struct config_item *item, char *page)
|
|
{
|
|
struct f_hid_opts *opts = to_f_hid_opts(item);
|
|
|
|
return sprintf(page, "%d:%d\n", major, opts->minor);
|
|
}
|
|
|
|
CONFIGFS_ATTR_RO(f_hid_opts_, dev);
|
|
|
|
static struct configfs_attribute *hid_attrs[] = {
|
|
&f_hid_opts_attr_subclass,
|
|
&f_hid_opts_attr_protocol,
|
|
&f_hid_opts_attr_report_length,
|
|
&f_hid_opts_attr_report_desc,
|
|
&f_hid_opts_attr_dev,
|
|
NULL,
|
|
};
|
|
|
|
static const struct config_item_type hid_func_type = {
|
|
.ct_item_ops = &hidg_item_ops,
|
|
.ct_attrs = hid_attrs,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static inline void hidg_put_minor(int minor)
|
|
{
|
|
ida_simple_remove(&hidg_ida, minor);
|
|
}
|
|
|
|
static void hidg_free_inst(struct usb_function_instance *f)
|
|
{
|
|
struct f_hid_opts *opts;
|
|
|
|
opts = container_of(f, struct f_hid_opts, func_inst);
|
|
|
|
mutex_lock(&hidg_ida_lock);
|
|
|
|
hidg_put_minor(opts->minor);
|
|
if (ida_is_empty(&hidg_ida))
|
|
ghid_cleanup();
|
|
|
|
mutex_unlock(&hidg_ida_lock);
|
|
|
|
if (opts->report_desc_alloc)
|
|
kfree(opts->report_desc);
|
|
|
|
kfree(opts);
|
|
}
|
|
|
|
static struct usb_function_instance *hidg_alloc_inst(void)
|
|
{
|
|
struct f_hid_opts *opts;
|
|
struct usb_function_instance *ret;
|
|
int status = 0;
|
|
|
|
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
|
|
if (!opts)
|
|
return ERR_PTR(-ENOMEM);
|
|
mutex_init(&opts->lock);
|
|
opts->func_inst.free_func_inst = hidg_free_inst;
|
|
ret = &opts->func_inst;
|
|
|
|
mutex_lock(&hidg_ida_lock);
|
|
|
|
if (ida_is_empty(&hidg_ida)) {
|
|
status = ghid_setup(NULL, HIDG_MINORS);
|
|
if (status) {
|
|
ret = ERR_PTR(status);
|
|
kfree(opts);
|
|
goto unlock;
|
|
}
|
|
}
|
|
|
|
opts->minor = hidg_get_minor();
|
|
if (opts->minor < 0) {
|
|
ret = ERR_PTR(opts->minor);
|
|
kfree(opts);
|
|
if (ida_is_empty(&hidg_ida))
|
|
ghid_cleanup();
|
|
goto unlock;
|
|
}
|
|
config_group_init_type_name(&opts->func_inst.group, "", &hid_func_type);
|
|
|
|
unlock:
|
|
mutex_unlock(&hidg_ida_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void hidg_free(struct usb_function *f)
|
|
{
|
|
struct f_hidg *hidg;
|
|
struct f_hid_opts *opts;
|
|
|
|
hidg = func_to_hidg(f);
|
|
opts = container_of(f->fi, struct f_hid_opts, func_inst);
|
|
kfree(hidg->report_desc);
|
|
kfree(hidg);
|
|
mutex_lock(&opts->lock);
|
|
--opts->refcnt;
|
|
mutex_unlock(&opts->lock);
|
|
}
|
|
|
|
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);
|
|
|
|
usb_free_all_descriptors(f);
|
|
}
|
|
|
|
static struct usb_function *hidg_alloc(struct usb_function_instance *fi)
|
|
{
|
|
struct f_hidg *hidg;
|
|
struct f_hid_opts *opts;
|
|
|
|
/* allocate and initialize one new instance */
|
|
hidg = kzalloc(sizeof(*hidg), GFP_KERNEL);
|
|
if (!hidg)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
opts = container_of(fi, struct f_hid_opts, func_inst);
|
|
|
|
mutex_lock(&opts->lock);
|
|
++opts->refcnt;
|
|
|
|
hidg->minor = opts->minor;
|
|
hidg->bInterfaceSubClass = opts->subclass;
|
|
hidg->bInterfaceProtocol = opts->protocol;
|
|
hidg->report_length = opts->report_length;
|
|
hidg->report_desc_length = opts->report_desc_length;
|
|
if (opts->report_desc) {
|
|
hidg->report_desc = kmemdup(opts->report_desc,
|
|
opts->report_desc_length,
|
|
GFP_KERNEL);
|
|
if (!hidg->report_desc) {
|
|
kfree(hidg);
|
|
mutex_unlock(&opts->lock);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&opts->lock);
|
|
|
|
hidg->func.name = "hid";
|
|
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;
|
|
hidg->func.free_func = hidg_free;
|
|
|
|
/* this could me made configurable at some point */
|
|
hidg->qlen = 4;
|
|
|
|
return &hidg->func;
|
|
}
|
|
|
|
DECLARE_USB_FUNCTION_INIT(hid, hidg_alloc_inst, hidg_alloc);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Fabien Chouteau");
|
|
|
|
int ghid_setup(struct usb_gadget *g, int count)
|
|
{
|
|
int status;
|
|
dev_t dev;
|
|
|
|
hidg_class = class_create(THIS_MODULE, "hidg");
|
|
if (IS_ERR(hidg_class)) {
|
|
status = PTR_ERR(hidg_class);
|
|
hidg_class = NULL;
|
|
return status;
|
|
}
|
|
|
|
status = alloc_chrdev_region(&dev, 0, count, "hidg");
|
|
if (status) {
|
|
class_destroy(hidg_class);
|
|
hidg_class = NULL;
|
|
return status;
|
|
}
|
|
|
|
major = MAJOR(dev);
|
|
minors = count;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ghid_cleanup(void)
|
|
{
|
|
if (major) {
|
|
unregister_chrdev_region(MKDEV(major, 0), minors);
|
|
major = minors = 0;
|
|
}
|
|
|
|
class_destroy(hidg_class);
|
|
hidg_class = NULL;
|
|
}
|