linux-stable/drivers/usb/gadget/f_hid.c

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/*
* f_hid.c -- USB HID function driver
*
* Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/utsname.h>
#include <linux/module.h>
#include <linux/hid.h>
#include <linux/cdev.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/uaccess.h>
#include <linux/wait.h>
#include <linux/usb/g_hid.h>
static int major, minors;
static struct class *hidg_class;
/*-------------------------------------------------------------------------*/
/* HID gadget struct */
struct f_hidg {
/* configuration */
unsigned char bInterfaceSubClass;
unsigned char bInterfaceProtocol;
unsigned short report_desc_length;
char *report_desc;
unsigned short report_length;
/* recv report */
char *set_report_buff;
unsigned short set_report_length;
spinlock_t spinlock;
wait_queue_head_t read_queue;
/* send report */
struct mutex lock;
bool write_pending;
wait_queue_head_t write_queue;
struct usb_request *req;
int minor;
struct cdev cdev;
struct usb_function func;
struct usb_ep *in_ep;
};
static inline struct f_hidg *func_to_hidg(struct usb_function *f)
{
return container_of(f, struct f_hidg, func);
}
/*-------------------------------------------------------------------------*/
/* Static descriptors */
static struct usb_interface_descriptor hidg_interface_desc = {
.bLength = sizeof hidg_interface_desc,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
.bAlternateSetting = 0,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_HID,
/* .bInterfaceSubClass = DYNAMIC */
/* .bInterfaceProtocol = DYNAMIC */
/* .iInterface = DYNAMIC */
};
static struct hid_descriptor hidg_desc = {
.bLength = sizeof hidg_desc,
.bDescriptorType = HID_DT_HID,
.bcdHID = 0x0101,
.bCountryCode = 0x00,
.bNumDescriptors = 0x1,
/*.desc[0].bDescriptorType = DYNAMIC */
/*.desc[0].wDescriptorLenght = DYNAMIC */
};
/* High-Speed Support */
static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
/*.wMaxPacketSize = DYNAMIC */
.bInterval = 4, /* FIXME: Add this field in the
* HID gadget configuration?
* (struct hidg_func_descriptor)
*/
};
static struct usb_descriptor_header *hidg_hs_descriptors[] = {
(struct usb_descriptor_header *)&hidg_interface_desc,
(struct usb_descriptor_header *)&hidg_desc,
(struct usb_descriptor_header *)&hidg_hs_in_ep_desc,
NULL,
};
/* Full-Speed Support */
static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
/*.wMaxPacketSize = DYNAMIC */
.bInterval = 10, /* FIXME: Add this field in the
* HID gadget configuration?
* (struct hidg_func_descriptor)
*/
};
static struct usb_descriptor_header *hidg_fs_descriptors[] = {
(struct usb_descriptor_header *)&hidg_interface_desc,
(struct usb_descriptor_header *)&hidg_desc,
(struct usb_descriptor_header *)&hidg_fs_in_ep_desc,
NULL,
};
/*-------------------------------------------------------------------------*/
/* Char Device */
static ssize_t f_hidg_read(struct file *file, char __user *buffer,
size_t count, loff_t *ptr)
{
struct f_hidg *hidg = file->private_data;
char *tmp_buff = NULL;
unsigned long flags;
if (!count)
return 0;
if (!access_ok(VERIFY_WRITE, buffer, count))
return -EFAULT;
spin_lock_irqsave(&hidg->spinlock, flags);
#define READ_COND (hidg->set_report_buff != NULL)
while (!READ_COND) {
spin_unlock_irqrestore(&hidg->spinlock, flags);
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
if (wait_event_interruptible(hidg->read_queue, READ_COND))
return -ERESTARTSYS;
spin_lock_irqsave(&hidg->spinlock, flags);
}
count = min_t(unsigned, count, hidg->set_report_length);
tmp_buff = hidg->set_report_buff;
hidg->set_report_buff = NULL;
spin_unlock_irqrestore(&hidg->spinlock, flags);
if (tmp_buff != NULL) {
/* copy to user outside spinlock */
count -= copy_to_user(buffer, tmp_buff, count);
kfree(tmp_buff);
} else
count = -ENOMEM;
return count;
}
static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_hidg *hidg = (struct f_hidg *)ep->driver_data;
if (req->status != 0) {
ERROR(hidg->func.config->cdev,
"End Point Request ERROR: %d\n", req->status);
}
hidg->write_pending = 0;
wake_up(&hidg->write_queue);
}
static ssize_t f_hidg_write(struct file *file, const char __user *buffer,
size_t count, loff_t *offp)
{
struct f_hidg *hidg = file->private_data;
ssize_t status = -ENOMEM;
if (!access_ok(VERIFY_READ, buffer, count))
return -EFAULT;
mutex_lock(&hidg->lock);
#define WRITE_COND (!hidg->write_pending)
/* write queue */
while (!WRITE_COND) {
mutex_unlock(&hidg->lock);
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
if (wait_event_interruptible_exclusive(
hidg->write_queue, WRITE_COND))
return -ERESTARTSYS;
mutex_lock(&hidg->lock);
}
count = min_t(unsigned, count, hidg->report_length);
status = copy_from_user(hidg->req->buf, buffer, count);
if (status != 0) {
ERROR(hidg->func.config->cdev,
"copy_from_user error\n");
mutex_unlock(&hidg->lock);
return -EINVAL;
}
hidg->req->status = 0;
hidg->req->zero = 0;
hidg->req->length = count;
hidg->req->complete = f_hidg_req_complete;
hidg->req->context = hidg;
hidg->write_pending = 1;
status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC);
if (status < 0) {
ERROR(hidg->func.config->cdev,
"usb_ep_queue error on int endpoint %zd\n", status);
hidg->write_pending = 0;
wake_up(&hidg->write_queue);
} else {
status = count;
}
mutex_unlock(&hidg->lock);
return status;
}
static unsigned int f_hidg_poll(struct file *file, poll_table *wait)
{
struct f_hidg *hidg = file->private_data;
unsigned int ret = 0;
poll_wait(file, &hidg->read_queue, wait);
poll_wait(file, &hidg->write_queue, wait);
if (WRITE_COND)
ret |= POLLOUT | POLLWRNORM;
if (READ_COND)
ret |= POLLIN | POLLRDNORM;
return ret;
}
#undef WRITE_COND
#undef READ_COND
static int f_hidg_release(struct inode *inode, struct file *fd)
{
fd->private_data = NULL;
return 0;
}
static int f_hidg_open(struct inode *inode, struct file *fd)
{
struct f_hidg *hidg =
container_of(inode->i_cdev, struct f_hidg, cdev);
fd->private_data = hidg;
return 0;
}
/*-------------------------------------------------------------------------*/
/* usb_function */
static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_hidg *hidg = (struct f_hidg *)req->context;
if (req->status != 0 || req->buf == NULL || req->actual == 0) {
ERROR(hidg->func.config->cdev, "%s FAILED\n", __func__);
return;
}
spin_lock(&hidg->spinlock);
hidg->set_report_buff = krealloc(hidg->set_report_buff,
req->actual, GFP_ATOMIC);
if (hidg->set_report_buff == NULL) {
spin_unlock(&hidg->spinlock);
return;
}
hidg->set_report_length = req->actual;
memcpy(hidg->set_report_buff, req->buf, req->actual);
spin_unlock(&hidg->spinlock);
wake_up(&hidg->read_queue);
}
static int hidg_setup(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct f_hidg *hidg = func_to_hidg(f);
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = cdev->req;
int status = 0;
__u16 value, length;
value = __le16_to_cpu(ctrl->wValue);
length = __le16_to_cpu(ctrl->wLength);
VDBG(cdev, "hid_setup crtl_request : bRequestType:0x%x bRequest:0x%x "
"Value:0x%x\n", ctrl->bRequestType, ctrl->bRequest, value);
switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
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");
goto stall;
break;
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
| HID_REQ_SET_REPORT):
VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength);
req->context = hidg;
req->complete = hidg_set_report_complete;
goto respond;
break;
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
| HID_REQ_SET_PROTOCOL):
VDBG(cdev, "set_protocol\n");
goto stall;
break;
case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8
| USB_REQ_GET_DESCRIPTOR):
switch (value >> 8) {
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 decriptor 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);
usb_ep_disable(hidg->in_ep);
hidg->in_ep->driver_data = NULL;
}
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);
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);
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 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,
llseek: automatically add .llseek fop All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 16:52:59 +00:00
.llseek = noop_llseek,
};
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;
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;
}
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;
}