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linux-sg2042/drivers/nfc/nfcmrvl/usb.c

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/**
* Marvell NFC-over-USB driver: USB interface related functions
*
* Copyright (C) 2014, Marvell International Ltd.
*
* This software file (the "File") is distributed by Marvell International
* Ltd. under the terms of the GNU General Public License Version 2, June 1991
* (the "License"). You may use, redistribute and/or modify this File in
* accordance with the terms and conditions of the License, a copy of which
* is available on the worldwide web at
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
*
* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
* this warranty disclaimer.
**/
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/nfc.h>
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include "nfcmrvl.h"
#define VERSION "1.0"
static struct usb_device_id nfcmrvl_table[] = {
{ USB_DEVICE_INTERFACE_CLASS(0x1286, 0x2046, 0xff) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, nfcmrvl_table);
#define NFCMRVL_USB_BULK_RUNNING 1
#define NFCMRVL_USB_SUSPENDING 2
struct nfcmrvl_usb_drv_data {
struct usb_device *udev;
struct usb_interface *intf;
unsigned long flags;
struct work_struct waker;
struct usb_anchor tx_anchor;
struct usb_anchor bulk_anchor;
struct usb_anchor deferred;
int tx_in_flight;
/* protects tx_in_flight */
spinlock_t txlock;
struct usb_endpoint_descriptor *bulk_tx_ep;
struct usb_endpoint_descriptor *bulk_rx_ep;
int suspend_count;
struct nfcmrvl_private *priv;
};
static int nfcmrvl_inc_tx(struct nfcmrvl_usb_drv_data *drv_data)
{
unsigned long flags;
int rv;
spin_lock_irqsave(&drv_data->txlock, flags);
rv = test_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
if (!rv)
drv_data->tx_in_flight++;
spin_unlock_irqrestore(&drv_data->txlock, flags);
return rv;
}
static void nfcmrvl_bulk_complete(struct urb *urb)
{
struct nfcmrvl_usb_drv_data *drv_data = urb->context;
int err;
dev_dbg(&drv_data->udev->dev, "urb %p status %d count %d",
urb, urb->status, urb->actual_length);
if (!test_bit(NFCMRVL_NCI_RUNNING, &drv_data->flags))
return;
if (!urb->status) {
if (nfcmrvl_nci_recv_frame(drv_data->priv, urb->transfer_buffer,
urb->actual_length) < 0)
nfc_err(&drv_data->udev->dev, "corrupted Rx packet");
}
if (!test_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags))
return;
usb_anchor_urb(urb, &drv_data->bulk_anchor);
usb_mark_last_busy(drv_data->udev);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
/* -EPERM: urb is being killed;
* -ENODEV: device got disconnected
*/
if (err != -EPERM && err != -ENODEV)
nfc_err(&drv_data->udev->dev,
"urb %p failed to resubmit (%d)", urb, -err);
usb_unanchor_urb(urb);
}
}
static int
nfcmrvl_submit_bulk_urb(struct nfcmrvl_usb_drv_data *drv_data, gfp_t mem_flags)
{
struct urb *urb;
unsigned char *buf;
unsigned int pipe;
int err, size = NFCMRVL_NCI_MAX_EVENT_SIZE;
if (!drv_data->bulk_rx_ep)
return -ENODEV;
urb = usb_alloc_urb(0, mem_flags);
if (!urb)
return -ENOMEM;
buf = kmalloc(size, mem_flags);
if (!buf) {
usb_free_urb(urb);
return -ENOMEM;
}
pipe = usb_rcvbulkpipe(drv_data->udev,
drv_data->bulk_rx_ep->bEndpointAddress);
usb_fill_bulk_urb(urb, drv_data->udev, pipe, buf, size,
nfcmrvl_bulk_complete, drv_data);
urb->transfer_flags |= URB_FREE_BUFFER;
usb_mark_last_busy(drv_data->udev);
usb_anchor_urb(urb, &drv_data->bulk_anchor);
err = usb_submit_urb(urb, mem_flags);
if (err) {
if (err != -EPERM && err != -ENODEV)
nfc_err(&drv_data->udev->dev,
"urb %p submission failed (%d)", urb, -err);
usb_unanchor_urb(urb);
}
usb_free_urb(urb);
return err;
}
static void nfcmrvl_tx_complete(struct urb *urb)
{
struct sk_buff *skb = urb->context;
struct nci_dev *ndev = (struct nci_dev *)skb->dev;
struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
nfc_info(priv->dev, "urb %p status %d count %d",
urb, urb->status, urb->actual_length);
spin_lock(&drv_data->txlock);
drv_data->tx_in_flight--;
spin_unlock(&drv_data->txlock);
kfree(urb->setup_packet);
kfree_skb(skb);
}
static int nfcmrvl_usb_nci_open(struct nfcmrvl_private *priv)
{
struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
int err;
err = usb_autopm_get_interface(drv_data->intf);
if (err)
return err;
drv_data->intf->needs_remote_wakeup = 1;
err = nfcmrvl_submit_bulk_urb(drv_data, GFP_KERNEL);
if (err)
goto failed;
set_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
nfcmrvl_submit_bulk_urb(drv_data, GFP_KERNEL);
usb_autopm_put_interface(drv_data->intf);
return 0;
failed:
usb_autopm_put_interface(drv_data->intf);
return err;
}
static void nfcmrvl_usb_stop_traffic(struct nfcmrvl_usb_drv_data *drv_data)
{
usb_kill_anchored_urbs(&drv_data->bulk_anchor);
}
static int nfcmrvl_usb_nci_close(struct nfcmrvl_private *priv)
{
struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
int err;
cancel_work_sync(&drv_data->waker);
clear_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
nfcmrvl_usb_stop_traffic(drv_data);
usb_kill_anchored_urbs(&drv_data->tx_anchor);
err = usb_autopm_get_interface(drv_data->intf);
if (err)
goto failed;
drv_data->intf->needs_remote_wakeup = 0;
usb_autopm_put_interface(drv_data->intf);
failed:
usb_scuttle_anchored_urbs(&drv_data->deferred);
return 0;
}
static int nfcmrvl_usb_nci_send(struct nfcmrvl_private *priv,
struct sk_buff *skb)
{
struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
struct urb *urb;
unsigned int pipe;
int err;
if (!drv_data->bulk_tx_ep)
return -ENODEV;
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
return -ENOMEM;
pipe = usb_sndbulkpipe(drv_data->udev,
drv_data->bulk_tx_ep->bEndpointAddress);
usb_fill_bulk_urb(urb, drv_data->udev, pipe, skb->data, skb->len,
nfcmrvl_tx_complete, skb);
err = nfcmrvl_inc_tx(drv_data);
if (err) {
usb_anchor_urb(urb, &drv_data->deferred);
schedule_work(&drv_data->waker);
err = 0;
goto done;
}
usb_anchor_urb(urb, &drv_data->tx_anchor);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
if (err != -EPERM && err != -ENODEV)
nfc_err(&drv_data->udev->dev,
"urb %p submission failed (%d)", urb, -err);
kfree(urb->setup_packet);
usb_unanchor_urb(urb);
} else {
usb_mark_last_busy(drv_data->udev);
}
done:
usb_free_urb(urb);
return err;
}
static struct nfcmrvl_if_ops usb_ops = {
.nci_open = nfcmrvl_usb_nci_open,
.nci_close = nfcmrvl_usb_nci_close,
.nci_send = nfcmrvl_usb_nci_send,
};
static void nfcmrvl_waker(struct work_struct *work)
{
struct nfcmrvl_usb_drv_data *drv_data =
container_of(work, struct nfcmrvl_usb_drv_data, waker);
int err;
err = usb_autopm_get_interface(drv_data->intf);
if (err)
return;
usb_autopm_put_interface(drv_data->intf);
}
static int nfcmrvl_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_endpoint_descriptor *ep_desc;
struct nfcmrvl_usb_drv_data *drv_data;
struct nfcmrvl_private *priv;
int i;
struct usb_device *udev = interface_to_usbdev(intf);
nfc_info(&udev->dev, "intf %p id %p", intf, id);
drv_data = devm_kzalloc(&intf->dev, sizeof(*drv_data), GFP_KERNEL);
if (!drv_data)
return -ENOMEM;
for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
ep_desc = &intf->cur_altsetting->endpoint[i].desc;
if (!drv_data->bulk_tx_ep &&
usb_endpoint_is_bulk_out(ep_desc)) {
drv_data->bulk_tx_ep = ep_desc;
continue;
}
if (!drv_data->bulk_rx_ep &&
usb_endpoint_is_bulk_in(ep_desc)) {
drv_data->bulk_rx_ep = ep_desc;
continue;
}
}
if (!drv_data->bulk_tx_ep || !drv_data->bulk_rx_ep)
return -ENODEV;
drv_data->udev = udev;
drv_data->intf = intf;
INIT_WORK(&drv_data->waker, nfcmrvl_waker);
spin_lock_init(&drv_data->txlock);
init_usb_anchor(&drv_data->tx_anchor);
init_usb_anchor(&drv_data->bulk_anchor);
init_usb_anchor(&drv_data->deferred);
priv = nfcmrvl_nci_register_dev(drv_data, &usb_ops,
&drv_data->udev->dev);
if (IS_ERR(priv))
return PTR_ERR(priv);
drv_data->priv = priv;
priv->dev = &drv_data->udev->dev;
usb_set_intfdata(intf, drv_data);
return 0;
}
static void nfcmrvl_disconnect(struct usb_interface *intf)
{
struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
if (!drv_data)
return;
nfc_info(&drv_data->udev->dev, "intf %p", intf);
nfcmrvl_nci_unregister_dev(drv_data->priv);
usb_set_intfdata(drv_data->intf, NULL);
}
#ifdef CONFIG_PM
static int nfcmrvl_suspend(struct usb_interface *intf, pm_message_t message)
{
struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
nfc_info(&drv_data->udev->dev, "intf %p", intf);
if (drv_data->suspend_count++)
return 0;
spin_lock_irq(&drv_data->txlock);
if (!(PMSG_IS_AUTO(message) && drv_data->tx_in_flight)) {
set_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
spin_unlock_irq(&drv_data->txlock);
} else {
spin_unlock_irq(&drv_data->txlock);
drv_data->suspend_count--;
return -EBUSY;
}
nfcmrvl_usb_stop_traffic(drv_data);
usb_kill_anchored_urbs(&drv_data->tx_anchor);
return 0;
}
static void nfcmrvl_play_deferred(struct nfcmrvl_usb_drv_data *drv_data)
{
struct urb *urb;
int err;
while ((urb = usb_get_from_anchor(&drv_data->deferred))) {
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err)
break;
drv_data->tx_in_flight++;
}
usb_scuttle_anchored_urbs(&drv_data->deferred);
}
static int nfcmrvl_resume(struct usb_interface *intf)
{
struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
int err = 0;
nfc_info(&drv_data->udev->dev, "intf %p", intf);
if (--drv_data->suspend_count)
return 0;
if (!test_bit(NFCMRVL_NCI_RUNNING, &drv_data->flags))
goto done;
if (test_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags)) {
err = nfcmrvl_submit_bulk_urb(drv_data, GFP_NOIO);
if (err) {
clear_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
goto failed;
}
nfcmrvl_submit_bulk_urb(drv_data, GFP_NOIO);
}
spin_lock_irq(&drv_data->txlock);
nfcmrvl_play_deferred(drv_data);
clear_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
spin_unlock_irq(&drv_data->txlock);
return 0;
failed:
usb_scuttle_anchored_urbs(&drv_data->deferred);
done:
spin_lock_irq(&drv_data->txlock);
clear_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
spin_unlock_irq(&drv_data->txlock);
return err;
}
#endif
static struct usb_driver nfcmrvl_usb_driver = {
.name = "nfcmrvl",
.probe = nfcmrvl_probe,
.disconnect = nfcmrvl_disconnect,
#ifdef CONFIG_PM
.suspend = nfcmrvl_suspend,
.resume = nfcmrvl_resume,
.reset_resume = nfcmrvl_resume,
#endif
.id_table = nfcmrvl_table,
.supports_autosuspend = 1,
.disable_hub_initiated_lpm = 1,
.soft_unbind = 1,
};
module_usb_driver(nfcmrvl_usb_driver);
MODULE_AUTHOR("Marvell International Ltd.");
MODULE_DESCRIPTION("Marvell NFC-over-USB driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL v2");
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