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