blob: a3e100ab3fee1f4cea68fa80528d7842f638fc3a [file] [log] [blame]
/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*/
#define pr_fmt(fmt) "%s: " fmt "\n", __func__
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/wait.h>
#include <linux/cdev.h>
#include <linux/usb/ccid_bridge.h>
#define CCID_CLASS_DECRIPTOR_TYPE 0x21
#define CCID_NOTIFY_SLOT_CHANGE 0x50
#define CCID_NOTIFY_HARDWARE_ERROR 0x51
#define CCID_ABORT_REQ 0x1
#define CCID_GET_CLK_FREQ_REQ 0x2
#define CCID_GET_DATA_RATES 0x3
#define CCID_BRIDGE_MSG_SZ 512
#define CCID_BRIDGE_OPEN_TIMEOUT 500 /* msec */
#define CCID_CONTROL_TIMEOUT 500 /* msec */
#define CCID_BRIDGE_MSG_TIMEOUT 500 /* msec */
struct ccid_bridge {
struct usb_device *udev;
struct usb_interface *intf;
unsigned int in_pipe;
unsigned int out_pipe;
unsigned int int_pipe;
struct urb *inturb;
struct urb *readurb;
struct urb *writeurb;
bool opened;
bool events_supported;
bool is_suspended;
struct mutex open_mutex;
struct mutex write_mutex;
struct mutex read_mutex;
struct mutex event_mutex;
int write_result;
int read_result;
int event_result;
wait_queue_head_t open_wq;
wait_queue_head_t write_wq;
wait_queue_head_t read_wq;
wait_queue_head_t event_wq;
struct usb_ccid_event cur_event;
void *intbuf;
dev_t chrdev;
struct cdev cdev;
struct class *class;
struct device *device;
};
static struct ccid_bridge *__ccid_bridge_dev;
static void ccid_bridge_out_cb(struct urb *urb)
{
struct ccid_bridge *ccid = urb->context;
if (urb->dev->state == USB_STATE_NOTATTACHED)
ccid->write_result = -ENODEV;
else
ccid->write_result = urb->status ? : urb->actual_length;
pr_debug("write result = %d", ccid->write_result);
wake_up(&ccid->write_wq);
}
static void ccid_bridge_in_cb(struct urb *urb)
{
struct ccid_bridge *ccid = urb->context;
if (urb->dev->state == USB_STATE_NOTATTACHED)
ccid->read_result = -ENODEV;
else
ccid->read_result = urb->status ? : urb->actual_length;
pr_debug("read result = %d", ccid->read_result);
wake_up(&ccid->read_wq);
}
static void ccid_bridge_int_cb(struct urb *urb)
{
struct ccid_bridge *ccid = urb->context;
u8 *msg_type;
bool wakeup = true;
if (urb->dev->state == USB_STATE_NOTATTACHED || (urb->status &&
urb->status != -ENOENT)) {
ccid->event_result = -ENODEV;
wakeup = true;
goto out;
}
/*
* Don't wakeup the event ioctl process during suspend.
* The suspend state is not visible to user space.
* we wake up the process after resume to send RESUME
* event if the device supports remote wakeup.
*/
if (urb->status == -ENOENT && !urb->actual_length) {
ccid->event_result = -ENOENT;
wakeup = false;
goto out;
}
ccid->event_result = 0;
msg_type = urb->transfer_buffer;
switch (*msg_type) {
case CCID_NOTIFY_SLOT_CHANGE:
pr_debug("NOTIFY_SLOT_CHANGE event arrived");
ccid->cur_event.event = USB_CCID_NOTIFY_SLOT_CHANGE_EVENT;
ccid->cur_event.u.notify.slot_icc_state = *(++msg_type);
break;
case CCID_NOTIFY_HARDWARE_ERROR:
pr_debug("NOTIFY_HARDWARE_ERROR event arrived");
ccid->cur_event.event = USB_CCID_HARDWARE_ERROR_EVENT;
ccid->cur_event.u.error.slot = *(++msg_type);
ccid->cur_event.u.error.seq = *(++msg_type);
ccid->cur_event.u.error.error_code = *(++msg_type);
break;
default:
pr_err("UNKNOWN event arrived\n");
ccid->event_result = -EINVAL;
}
out:
pr_debug("returning %d", ccid->event_result);
if (wakeup)
wake_up(&ccid->event_wq);
}
static int ccid_bridge_submit_inturb(struct ccid_bridge *ccid)
{
int ret = 0;
/*
* Don't resume the bus to submit an interrupt URB.
* We submit the URB in resume path. This is important.
* Because the device will be in suspend state during
* multiple system suspend/resume cycles. The user space
* process comes here during system resume after it is
* unfrozen.
*/
if (!ccid->int_pipe || ccid->is_suspended)
goto out;
ret = usb_autopm_get_interface(ccid->intf);
if (ret < 0) {
pr_debug("fail to get autopm with %d\n", ret);
goto out;
}
ret = usb_submit_urb(ccid->inturb, GFP_KERNEL);
if (ret < 0)
pr_err("fail to submit int urb with %d\n", ret);
usb_autopm_put_interface(ccid->intf);
out:
pr_debug("returning %d", ret);
return ret;
}
static int ccid_bridge_get_event(struct ccid_bridge *ccid)
{
int ret = 0;
/*
* The first event returned after the device resume
* will be RESUME event. This event is set by
* the resume.
*/
if (ccid->cur_event.event)
goto out;
ccid->event_result = -EINPROGRESS;
ret = ccid_bridge_submit_inturb(ccid);
if (ret < 0)
goto out;
/*
* Wait for the notification on interrupt endpoint
* or remote wakeup event from the resume. The
* int urb completion handler and resume callback
* take care of setting the current event.
*/
mutex_unlock(&ccid->event_mutex);
ret = wait_event_interruptible(ccid->event_wq,
(ccid->event_result != -EINPROGRESS));
mutex_lock(&ccid->event_mutex);
if (ret == -ERESTARTSYS) /* interrupted */
usb_kill_urb(ccid->inturb);
else
ret = ccid->event_result;
out:
pr_debug("returning %d", ret);
return ret;
}
static int ccid_bridge_open(struct inode *ip, struct file *fp)
{
struct ccid_bridge *ccid = container_of(ip->i_cdev,
struct ccid_bridge, cdev);
int ret;
pr_debug("called");
mutex_lock(&ccid->open_mutex);
if (ccid->opened) {
ret = -EBUSY;
goto out;
}
mutex_unlock(&ccid->open_mutex);
ret = wait_event_interruptible_timeout(ccid->open_wq,
ccid->intf != NULL, msecs_to_jiffies(
CCID_BRIDGE_OPEN_TIMEOUT));
mutex_lock(&ccid->open_mutex);
if (ret != -ERESTARTSYS && ccid->intf) {
fp->private_data = ccid;
ccid->opened = true;
ret = 0;
} else if (!ret) { /* timed out */
ret = -ENODEV;
}
out:
mutex_unlock(&ccid->open_mutex);
pr_debug("returning %d", ret);
return ret;
}
static ssize_t ccid_bridge_write(struct file *fp, const char __user *ubuf,
size_t count, loff_t *pos)
{
struct ccid_bridge *ccid = fp->private_data;
int ret;
char *kbuf;
pr_debug("called with %d", count);
if (!ccid->intf) {
pr_debug("intf is not active");
return -ENODEV;
}
mutex_lock(&ccid->write_mutex);
if (!count || count > CCID_BRIDGE_MSG_SZ) {
pr_err("invalid count");
ret = -EINVAL;
goto out;
}
kbuf = kmalloc(count, GFP_KERNEL);
if (!kbuf) {
pr_err("fail to allocate memory");
ret = -ENOMEM;
goto out;
}
ret = copy_from_user(kbuf, ubuf, count);
if (ret) {
pr_err("fail to copy user buf");
ret = -EFAULT;
goto free_kbuf;
}
ret = usb_autopm_get_interface(ccid->intf);
if (ret) {
pr_err("fail to get autopm with %d", ret);
goto free_kbuf;
}
ccid->write_result = 0;
usb_fill_bulk_urb(ccid->writeurb, ccid->udev, ccid->out_pipe,
kbuf, count, ccid_bridge_out_cb, ccid);
ret = usb_submit_urb(ccid->writeurb, GFP_KERNEL);
if (ret < 0) {
pr_err("urb submit fail with %d", ret);
goto put_pm;
}
ret = wait_event_interruptible_timeout(ccid->write_wq,
ccid->write_result != 0,
msecs_to_jiffies(CCID_BRIDGE_MSG_TIMEOUT));
if (!ret || ret == -ERESTARTSYS) { /* timedout or interrupted */
usb_kill_urb(ccid->writeurb);
if (!ret)
ret = -ETIMEDOUT;
} else {
ret = ccid->write_result;
}
pr_debug("returning %d", ret);
put_pm:
if (ret != -ENODEV)
usb_autopm_put_interface(ccid->intf);
free_kbuf:
kfree(kbuf);
out:
mutex_unlock(&ccid->write_mutex);
return ret;
}
static ssize_t ccid_bridge_read(struct file *fp, char __user *ubuf,
size_t count, loff_t *pos)
{
struct ccid_bridge *ccid = fp->private_data;
int ret;
char *kbuf;
pr_debug("called with %d", count);
if (!ccid->intf) {
pr_debug("intf is not active");
return -ENODEV;
}
mutex_lock(&ccid->read_mutex);
if (!count || count > CCID_BRIDGE_MSG_SZ) {
pr_err("invalid count");
ret = -EINVAL;
goto out;
}
kbuf = kmalloc(count, GFP_KERNEL);
if (!kbuf) {
pr_err("fail to allocate memory");
ret = -ENOMEM;
goto out;
}
ret = usb_autopm_get_interface(ccid->intf);
if (ret) {
pr_err("fail to get autopm with %d", ret);
goto free_kbuf;
}
ccid->read_result = 0;
usb_fill_bulk_urb(ccid->readurb, ccid->udev, ccid->in_pipe,
kbuf, count, ccid_bridge_in_cb, ccid);
ret = usb_submit_urb(ccid->readurb, GFP_KERNEL);
if (ret < 0) {
pr_err("urb submit fail with %d", ret);
if (ret != -ENODEV)
usb_autopm_put_interface(ccid->intf);
goto free_kbuf;
}
ret = wait_event_interruptible_timeout(ccid->read_wq,
ccid->read_result != 0,
msecs_to_jiffies(CCID_BRIDGE_MSG_TIMEOUT));
if (!ret || ret == -ERESTARTSYS) { /* timedout or interrupted */
usb_kill_urb(ccid->readurb);
if (!ret)
ret = -ETIMEDOUT;
} else {
ret = ccid->read_result;
}
if (ret > 0) {
if (copy_to_user(ubuf, kbuf, ret))
ret = -EFAULT;
}
usb_autopm_put_interface(ccid->intf);
pr_debug("returning %d", ret);
free_kbuf:
kfree(kbuf);
out:
mutex_unlock(&ccid->read_mutex);
return ret;
}
static long
ccid_bridge_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
{
struct ccid_bridge *ccid = fp->private_data;
char *buf;
struct usb_ccid_data data;
struct usb_ccid_abort abort;
struct usb_descriptor_header *header;
int ret;
struct usb_device *udev = ccid->udev;
__u8 intf = ccid->intf->cur_altsetting->desc.bInterfaceNumber;
__u8 breq = 0;
if (!ccid->intf) {
pr_debug("intf is not active");
return -ENODEV;
}
mutex_lock(&ccid->event_mutex);
switch (cmd) {
case USB_CCID_GET_CLASS_DESC:
pr_debug("GET_CLASS_DESC ioctl called");
ret = copy_from_user(&data, (void __user *)arg, sizeof(data));
if (ret) {
ret = -EFAULT;
break;
}
ret = __usb_get_extra_descriptor(udev->rawdescriptors[0],
le16_to_cpu(udev->config[0].desc.wTotalLength),
CCID_CLASS_DECRIPTOR_TYPE, (void **) &buf);
if (ret) {
ret = -ENOENT;
break;
}
header = (struct usb_descriptor_header *) buf;
if (data.length != header->bLength) {
ret = -EINVAL;
break;
}
ret = copy_to_user((void __user *)data.data, buf, data.length);
if (ret)
ret = -EFAULT;
break;
case USB_CCID_GET_CLOCK_FREQUENCIES:
pr_debug("GET_CLOCK_FREQUENCIES ioctl called");
breq = CCID_GET_CLK_FREQ_REQ;
/* fall through */
case USB_CCID_GET_DATA_RATES:
if (!breq) {
pr_debug("GET_DATA_RATES ioctl called");
breq = CCID_GET_DATA_RATES;
}
ret = copy_from_user(&data, (void __user *)arg, sizeof(data));
if (ret) {
ret = -EFAULT;
break;
}
buf = kmalloc(data.length, GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
break;
}
ret = usb_autopm_get_interface(ccid->intf);
if (ret < 0) {
pr_debug("fail to get autopm with %d", ret);
break;
}
ret = usb_control_msg(ccid->udev,
usb_rcvctrlpipe(ccid->udev, 0),
breq, (USB_DIR_IN | USB_TYPE_CLASS |
USB_RECIP_INTERFACE), 0, intf, buf,
data.length, CCID_CONTROL_TIMEOUT);
usb_autopm_put_interface(ccid->intf);
if (ret == data.length) {
ret = copy_to_user((void __user *)data.data, buf,
data.length);
if (ret)
ret = -EFAULT;
} else {
if (ret > 0)
ret = -EPIPE;
}
kfree(buf);
break;
case USB_CCID_ABORT:
pr_debug("ABORT ioctl called");
breq = CCID_ABORT_REQ;
ret = copy_from_user(&abort, (void __user *)arg, sizeof(abort));
if (ret) {
ret = -EFAULT;
break;
}
ret = usb_autopm_get_interface(ccid->intf);
if (ret < 0) {
pr_debug("fail to get autopm with %d", ret);
break;
}
ret = usb_control_msg(ccid->udev,
usb_sndctrlpipe(ccid->udev, 0),
breq, (USB_DIR_OUT | USB_TYPE_CLASS |
USB_RECIP_INTERFACE),
(abort.seq << 8) | abort.slot, intf, NULL,
0, CCID_CONTROL_TIMEOUT);
if (ret < 0)
pr_err("abort request failed with err %d\n", ret);
usb_autopm_put_interface(ccid->intf);
break;
case USB_CCID_GET_EVENT:
pr_debug("GET_EVENT ioctl called");
if (!ccid->events_supported) {
ret = -ENOENT;
break;
}
ret = ccid_bridge_get_event(ccid);
if (ret == 0) {
ret = copy_to_user((void __user *)arg, &ccid->cur_event,
sizeof(ccid->cur_event));
if (ret)
ret = -EFAULT;
}
ccid->cur_event.event = 0;
break;
default:
pr_err("UNKNOWN ioctl called");
ret = -EINVAL;
break;
}
mutex_unlock(&ccid->event_mutex);
pr_debug("returning %d", ret);
return ret;
}
static int ccid_bridge_release(struct inode *ip, struct file *fp)
{
struct ccid_bridge *ccid = fp->private_data;
pr_debug("called");
usb_kill_urb(ccid->writeurb);
usb_kill_urb(ccid->readurb);
if (ccid->int_pipe)
usb_kill_urb(ccid->inturb);
ccid->event_result = -EIO;
wake_up(&ccid->event_wq);
mutex_lock(&ccid->open_mutex);
ccid->opened = false;
mutex_unlock(&ccid->open_mutex);
return 0;
}
static const struct file_operations ccid_bridge_fops = {
.owner = THIS_MODULE,
.open = ccid_bridge_open,
.write = ccid_bridge_write,
.read = ccid_bridge_read,
.unlocked_ioctl = ccid_bridge_ioctl,
.release = ccid_bridge_release,
};
static int ccid_bridge_suspend(struct usb_interface *intf, pm_message_t message)
{
struct ccid_bridge *ccid = usb_get_intfdata(intf);
int ret = 0;
pr_debug("called");
if (!ccid->opened)
goto out;
mutex_lock(&ccid->event_mutex);
if (ccid->int_pipe) {
usb_kill_urb(ccid->inturb);
if (ccid->event_result != -ENOENT) {
ret = -EBUSY;
goto rel_mutex;
}
}
ccid->is_suspended = true;
rel_mutex:
mutex_unlock(&ccid->event_mutex);
out:
pr_debug("returning %d", ret);
return ret;
}
static int ccid_bridge_resume(struct usb_interface *intf)
{
struct ccid_bridge *ccid = usb_get_intfdata(intf);
int ret;
pr_debug("called");
if (!ccid->opened)
goto out;
mutex_lock(&ccid->event_mutex);
ccid->is_suspended = false;
if (device_can_wakeup(&ccid->udev->dev)) {
ccid->event_result = 0;
ccid->cur_event.event = USB_CCID_RESUME_EVENT;
wake_up(&ccid->event_wq);
} else if (ccid->int_pipe) {
ccid->event_result = -EINPROGRESS;
ret = usb_submit_urb(ccid->inturb, GFP_KERNEL);
if (ret < 0)
pr_debug("fail to submit inturb with %d\n", ret);
}
mutex_unlock(&ccid->event_mutex);
out:
return 0;
}
static int
ccid_bridge_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct ccid_bridge *ccid = __ccid_bridge_dev;
struct usb_host_interface *intf_desc;
struct usb_endpoint_descriptor *ep_desc;
struct usb_host_endpoint *ep;
__u8 epin_addr = 0, epout_addr = 0, epint_addr = 0;
int i, ret;
intf_desc = intf->cur_altsetting;
if (intf_desc->desc.bNumEndpoints > 3)
return -ENODEV;
for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
ep_desc = &intf_desc->endpoint[i].desc;
if (usb_endpoint_is_bulk_in(ep_desc))
epin_addr = ep_desc->bEndpointAddress;
else if (usb_endpoint_is_bulk_out(ep_desc))
epout_addr = ep_desc->bEndpointAddress;
else if (usb_endpoint_is_int_in(ep_desc))
epint_addr = ep_desc->bEndpointAddress;
else
return -ENODEV;
}
if (!epin_addr || !epout_addr)
return -ENODEV;
ccid->udev = usb_get_dev(interface_to_usbdev(intf));
ccid->in_pipe = usb_rcvbulkpipe(ccid->udev, epin_addr);
ccid->out_pipe = usb_sndbulkpipe(ccid->udev, epout_addr);
if (epint_addr)
ccid->int_pipe = usb_rcvbulkpipe(ccid->udev, epint_addr);
ccid->writeurb = usb_alloc_urb(0, GFP_KERNEL);
if (!ccid->writeurb) {
pr_err("fail to allocate write urb");
ret = -ENOMEM;
goto put_udev;
}
ccid->readurb = usb_alloc_urb(0, GFP_KERNEL);
if (!ccid->readurb) {
pr_err("fail to allocate read urb");
ret = -ENOMEM;
goto free_writeurb;
}
if (ccid->int_pipe) {
pr_debug("interrupt endpoint is present");
ep = usb_pipe_endpoint(ccid->udev, ccid->int_pipe);
ccid->inturb = usb_alloc_urb(0, GFP_KERNEL);
if (!ccid->inturb) {
pr_err("fail to allocate int urb");
ret = -ENOMEM;
goto free_readurb;
}
ccid->intbuf = kmalloc(usb_endpoint_maxp(&ep->desc),
GFP_KERNEL);
if (!ccid->intbuf) {
pr_err("fail to allocated int buf");
ret = -ENOMEM;
goto free_inturb;
}
usb_fill_int_urb(ccid->inturb, ccid->udev,
usb_rcvintpipe(ccid->udev, epint_addr),
ccid->intbuf, usb_endpoint_maxp(&ep->desc),
ccid_bridge_int_cb, ccid,
ep->desc.bInterval);
}
if (ccid->int_pipe || device_can_wakeup(&ccid->udev->dev)) {
pr_debug("event support is present");
ccid->events_supported = true;
}
usb_set_intfdata(intf, ccid);
mutex_lock(&ccid->open_mutex);
ccid->intf = intf;
wake_up(&ccid->open_wq);
mutex_unlock(&ccid->open_mutex);
pr_info("success");
return 0;
free_inturb:
if (ccid->int_pipe)
usb_free_urb(ccid->inturb);
free_readurb:
usb_free_urb(ccid->readurb);
free_writeurb:
usb_free_urb(ccid->writeurb);
put_udev:
usb_put_dev(ccid->udev);
return ret;
}
static void ccid_bridge_disconnect(struct usb_interface *intf)
{
struct ccid_bridge *ccid = usb_get_intfdata(intf);
pr_debug("called");
usb_kill_urb(ccid->writeurb);
usb_kill_urb(ccid->readurb);
if (ccid->int_pipe)
usb_kill_urb(ccid->inturb);
ccid->event_result = -ENODEV;
wake_up(&ccid->event_wq);
/*
* This would synchronize any ongoing read/write/ioctl.
* After acquiring the mutex, we can safely set
* intf to NULL.
*/
mutex_lock(&ccid->open_mutex);
mutex_lock(&ccid->write_mutex);
mutex_lock(&ccid->read_mutex);
mutex_lock(&ccid->event_mutex);
usb_free_urb(ccid->writeurb);
usb_free_urb(ccid->readurb);
if (ccid->int_pipe) {
usb_free_urb(ccid->inturb);
kfree(ccid->intbuf);
ccid->int_pipe = 0;
}
ccid->intf = NULL;
mutex_unlock(&ccid->event_mutex);
mutex_unlock(&ccid->read_mutex);
mutex_unlock(&ccid->write_mutex);
mutex_unlock(&ccid->open_mutex);
}
static const struct usb_device_id ccid_bridge_ids[] = {
{ USB_INTERFACE_INFO(USB_CLASS_CSCID, 0, 0) },
{} /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, ccid_bridge_ids);
static struct usb_driver ccid_bridge_driver = {
.name = "ccid_bridge",
.probe = ccid_bridge_probe,
.disconnect = ccid_bridge_disconnect,
.suspend = ccid_bridge_suspend,
.resume = ccid_bridge_resume,
.id_table = ccid_bridge_ids,
.supports_autosuspend = 1,
};
static int __init ccid_bridge_init(void)
{
int ret;
struct ccid_bridge *ccid;
ccid = kzalloc(sizeof(*ccid), GFP_KERNEL);
if (!ccid) {
pr_err("Fail to allocate ccid");
ret = -ENOMEM;
goto out;
}
__ccid_bridge_dev = ccid;
mutex_init(&ccid->open_mutex);
mutex_init(&ccid->write_mutex);
mutex_init(&ccid->read_mutex);
mutex_init(&ccid->event_mutex);
init_waitqueue_head(&ccid->open_wq);
init_waitqueue_head(&ccid->write_wq);
init_waitqueue_head(&ccid->read_wq);
init_waitqueue_head(&ccid->event_wq);
ret = usb_register(&ccid_bridge_driver);
if (ret < 0) {
pr_err("Fail to register ccid usb driver with %d", ret);
goto free_ccid;
}
ret = alloc_chrdev_region(&ccid->chrdev, 0, 1, "ccid_bridge");
if (ret < 0) {
pr_err("Fail to allocate ccid char dev region with %d", ret);
goto unreg_driver;
}
ccid->class = class_create(THIS_MODULE, "ccid_bridge");
if (IS_ERR(ccid->class)) {
ret = PTR_ERR(ccid->class);
pr_err("Fail to create ccid class with %d", ret);
goto unreg_chrdev;
}
cdev_init(&ccid->cdev, &ccid_bridge_fops);
ccid->cdev.owner = THIS_MODULE;
ret = cdev_add(&ccid->cdev, ccid->chrdev, 1);
if (ret < 0) {
pr_err("Fail to add ccid cdev with %d", ret);
goto destroy_class;
}
ccid->device = device_create(ccid->class,
NULL, ccid->chrdev, NULL,
"ccid_bridge");
if (IS_ERR(ccid->device)) {
ret = PTR_ERR(ccid->device);
pr_err("Fail to create ccid device with %d", ret);
goto del_cdev;
}
pr_info("success");
return 0;
del_cdev:
cdev_del(&ccid->cdev);
destroy_class:
class_destroy(ccid->class);
unreg_chrdev:
unregister_chrdev_region(ccid->chrdev, 1);
unreg_driver:
usb_deregister(&ccid_bridge_driver);
free_ccid:
mutex_destroy(&ccid->open_mutex);
mutex_destroy(&ccid->write_mutex);
mutex_destroy(&ccid->read_mutex);
mutex_destroy(&ccid->event_mutex);
kfree(ccid);
__ccid_bridge_dev = NULL;
out:
return ret;
}
static void __exit ccid_bridge_exit(void)
{
struct ccid_bridge *ccid = __ccid_bridge_dev;
pr_debug("called");
device_destroy(ccid->class, ccid->chrdev);
cdev_del(&ccid->cdev);
class_destroy(ccid->class);
unregister_chrdev_region(ccid->chrdev, 1);
usb_deregister(&ccid_bridge_driver);
mutex_destroy(&ccid->open_mutex);
mutex_destroy(&ccid->write_mutex);
mutex_destroy(&ccid->read_mutex);
mutex_destroy(&ccid->event_mutex);
kfree(ccid);
__ccid_bridge_dev = NULL;
}
module_init(ccid_bridge_init);
module_exit(ccid_bridge_exit);
MODULE_DESCRIPTION("USB CCID bridge driver");
MODULE_LICENSE("GPL v2");