--- /dev/null
+/*
+ * f_phonet.c -- USB CDC Phonet function
+ *
+ * Copyright (C) 2007-2008 Nokia Corporation. All rights reserved.
+ *
+ * Author: Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+
+#include <linux/netdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_phonet.h>
+#include <linux/if_arp.h>
+
+#include <linux/usb/ch9.h>
+#include <linux/usb/cdc.h>
+#include <linux/usb/composite.h>
+
+#include "u_phonet.h"
+
+#define PN_MEDIA_USB 0x1B
+
+/*-------------------------------------------------------------------------*/
+
+struct phonet_port {
+ struct f_phonet *usb;
+ spinlock_t lock;
+};
+
+struct f_phonet {
+ struct usb_function function;
+ struct net_device *dev;
+ struct usb_ep *in_ep, *out_ep;
+
+ struct usb_request *in_req;
+ struct usb_request *out_reqv[0];
+};
+
+static int phonet_rxq_size = 2;
+
+static inline struct f_phonet *func_to_pn(struct usb_function *f)
+{
+ return container_of(f, struct f_phonet, function);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#define USB_CDC_SUBCLASS_PHONET 0xfe
+#define USB_CDC_PHONET_TYPE 0xab
+
+static struct usb_interface_descriptor
+pn_control_intf_desc = {
+ .bLength = sizeof pn_control_intf_desc,
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ /* .bInterfaceNumber = DYNAMIC, */
+ .bInterfaceClass = USB_CLASS_COMM,
+ .bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET,
+};
+
+static const struct usb_cdc_header_desc
+pn_header_desc = {
+ .bLength = sizeof pn_header_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = USB_CDC_HEADER_TYPE,
+ .bcdCDC = __constant_cpu_to_le16(0x0110),
+};
+
+static const struct usb_cdc_header_desc
+pn_phonet_desc = {
+ .bLength = sizeof pn_phonet_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = USB_CDC_PHONET_TYPE,
+ .bcdCDC = __constant_cpu_to_le16(0x1505), /* ??? */
+};
+
+static struct usb_cdc_union_desc
+pn_union_desc = {
+ .bLength = sizeof pn_union_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = USB_CDC_UNION_TYPE,
+
+ /* .bMasterInterface0 = DYNAMIC, */
+ /* .bSlaveInterface0 = DYNAMIC, */
+};
+
+static struct usb_interface_descriptor
+pn_data_nop_intf_desc = {
+ .bLength = sizeof pn_data_nop_intf_desc,
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ /* .bInterfaceNumber = DYNAMIC, */
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_CDC_DATA,
+};
+
+static struct usb_interface_descriptor
+pn_data_intf_desc = {
+ .bLength = sizeof pn_data_intf_desc,
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ /* .bInterfaceNumber = DYNAMIC, */
+ .bAlternateSetting = 1,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_CDC_DATA,
+};
+
+static struct usb_endpoint_descriptor
+pn_fs_sink_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor
+pn_hs_sink_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor
+pn_fs_source_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor
+pn_hs_source_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_descriptor_header *fs_pn_function[] = {
+ (struct usb_descriptor_header *) &pn_control_intf_desc,
+ (struct usb_descriptor_header *) &pn_header_desc,
+ (struct usb_descriptor_header *) &pn_phonet_desc,
+ (struct usb_descriptor_header *) &pn_union_desc,
+ (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
+ (struct usb_descriptor_header *) &pn_data_intf_desc,
+ (struct usb_descriptor_header *) &pn_fs_sink_desc,
+ (struct usb_descriptor_header *) &pn_fs_source_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *hs_pn_function[] = {
+ (struct usb_descriptor_header *) &pn_control_intf_desc,
+ (struct usb_descriptor_header *) &pn_header_desc,
+ (struct usb_descriptor_header *) &pn_phonet_desc,
+ (struct usb_descriptor_header *) &pn_union_desc,
+ (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
+ (struct usb_descriptor_header *) &pn_data_intf_desc,
+ (struct usb_descriptor_header *) &pn_hs_sink_desc,
+ (struct usb_descriptor_header *) &pn_hs_source_desc,
+ NULL,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int pn_net_open(struct net_device *dev)
+{
+ if (netif_carrier_ok(dev))
+ netif_wake_queue(dev);
+ return 0;
+}
+
+static int pn_net_close(struct net_device *dev)
+{
+ netif_stop_queue(dev);
+ return 0;
+}
+
+static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct f_phonet *fp = ep->driver_data;
+ struct net_device *dev = fp->dev;
+ struct sk_buff *skb = req->context;
+
+ switch (req->status) {
+ case 0:
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+ break;
+
+ case -ESHUTDOWN: /* disconnected */
+ case -ECONNRESET: /* disabled */
+ dev->stats.tx_aborted_errors++;
+ default:
+ dev->stats.tx_errors++;
+ }
+
+ dev_kfree_skb_any(skb);
+ if (netif_carrier_ok(dev))
+ netif_wake_queue(dev);
+}
+
+static int pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct phonet_port *port = netdev_priv(dev);
+ struct f_phonet *fp;
+ struct usb_request *req;
+ unsigned long flags;
+
+ if (skb->protocol != htons(ETH_P_PHONET))
+ goto out;
+
+ spin_lock_irqsave(&port->lock, flags);
+ fp = port->usb;
+ if (unlikely(!fp)) /* race with carrier loss */
+ goto out_unlock;
+
+ req = fp->in_req;
+ req->buf = skb->data;
+ req->length = skb->len;
+ req->complete = pn_tx_complete;
+ req->zero = 1;
+ req->context = skb;
+
+ if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
+ goto out_unlock;
+
+ netif_stop_queue(dev);
+ skb = NULL;
+
+out_unlock:
+ spin_unlock_irqrestore(&port->lock, flags);
+out:
+ if (unlikely(skb)) {
+ dev_kfree_skb_any(skb);
+ dev->stats.tx_dropped++;
+ }
+ return 0;
+}
+
+static int pn_net_mtu(struct net_device *dev, int new_mtu)
+{
+ struct phonet_port *port = netdev_priv(dev);
+ unsigned long flags;
+ int err = -EBUSY;
+
+ if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
+ return -EINVAL;
+
+ spin_lock_irqsave(&port->lock, flags);
+ if (!netif_carrier_ok(dev)) {
+ dev->mtu = new_mtu;
+ err = 0;
+ }
+ spin_unlock_irqrestore(&port->lock, flags);
+ return err;
+}
+
+static void pn_net_setup(struct net_device *dev)
+{
+ dev->features = 0;
+ dev->type = ARPHRD_PHONET;
+ dev->flags = IFF_POINTOPOINT | IFF_NOARP;
+ dev->mtu = PHONET_DEV_MTU;
+ dev->hard_header_len = 1;
+ dev->dev_addr[0] = PN_MEDIA_USB;
+ dev->addr_len = 1;
+ dev->tx_queue_len = 1;
+
+ dev->destructor = free_netdev;
+ dev->header_ops = &phonet_header_ops;
+ dev->open = pn_net_open;
+ dev->stop = pn_net_close;
+ dev->hard_start_xmit = pn_net_xmit; /* mandatory */
+ dev->change_mtu = pn_net_mtu;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Queue buffer for data from the host
+ */
+static int
+pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
+{
+ struct sk_buff *skb;
+ const size_t size = fp->dev->mtu;
+ int err;
+
+ skb = alloc_skb(size, gfp_flags);
+ if (!skb)
+ return -ENOMEM;
+
+ req->buf = skb->data;
+ req->length = size;
+ req->context = skb;
+
+ err = usb_ep_queue(fp->out_ep, req, gfp_flags);
+ if (unlikely(err))
+ dev_kfree_skb_any(skb);
+ return err;
+}
+
+static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct f_phonet *fp = ep->driver_data;
+ struct net_device *dev = fp->dev;
+ struct sk_buff *skb = req->context;
+ int status = req->status;
+
+ switch (status) {
+ case 0:
+ if (unlikely(!netif_running(dev)))
+ break;
+ if (unlikely(req->actual < 1))
+ break;
+ skb_put(skb, req->actual);
+ skb->protocol = htons(ETH_P_PHONET);
+ skb_reset_mac_header(skb);
+ __skb_pull(skb, 1);
+ skb->dev = dev;
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += skb->len;
+
+ netif_rx(skb);
+ skb = NULL;
+ break;
+
+ /* Do not resubmit in these cases: */
+ case -ESHUTDOWN: /* disconnect */
+ case -ECONNABORTED: /* hw reset */
+ case -ECONNRESET: /* dequeued (unlink or netif down) */
+ req = NULL;
+ break;
+
+ /* Do resubmit in these cases: */
+ case -EOVERFLOW: /* request buffer overflow */
+ dev->stats.rx_over_errors++;
+ default:
+ dev->stats.rx_errors++;
+ break;
+ }
+
+ if (skb)
+ dev_kfree_skb_any(skb);
+ if (req)
+ pn_rx_submit(fp, req, GFP_ATOMIC);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void __pn_reset(struct usb_function *f)
+{
+ struct f_phonet *fp = func_to_pn(f);
+ struct net_device *dev = fp->dev;
+ struct phonet_port *port = netdev_priv(dev);
+
+ netif_carrier_off(dev);
+ netif_stop_queue(dev);
+ port->usb = NULL;
+
+ usb_ep_disable(fp->out_ep);
+ usb_ep_disable(fp->in_ep);
+}
+
+static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+ struct f_phonet *fp = func_to_pn(f);
+ struct usb_gadget *gadget = fp->function.config->cdev->gadget;
+
+ if (intf == pn_control_intf_desc.bInterfaceNumber)
+ /* control interface, no altsetting */
+ return (alt > 0) ? -EINVAL : 0;
+
+ if (intf == pn_data_intf_desc.bInterfaceNumber) {
+ struct net_device *dev = fp->dev;
+ struct phonet_port *port = netdev_priv(dev);
+
+ /* data intf (0: inactive, 1: active) */
+ if (alt > 1)
+ return -EINVAL;
+
+ spin_lock(&port->lock);
+ __pn_reset(f);
+ if (alt == 1) {
+ struct usb_endpoint_descriptor *out, *in;
+ int i;
+
+ out = ep_choose(gadget,
+ &pn_hs_sink_desc,
+ &pn_fs_sink_desc);
+ in = ep_choose(gadget,
+ &pn_hs_source_desc,
+ &pn_fs_source_desc);
+ usb_ep_enable(fp->out_ep, out);
+ usb_ep_enable(fp->in_ep, in);
+
+ port->usb = fp;
+ fp->out_ep->driver_data = fp;
+ fp->in_ep->driver_data = fp;
+
+ netif_carrier_on(dev);
+ if (netif_running(dev))
+ netif_wake_queue(dev);
+ for (i = 0; i < phonet_rxq_size; i++)
+ pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
+ }
+ spin_unlock(&port->lock);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int pn_get_alt(struct usb_function *f, unsigned intf)
+{
+ struct f_phonet *fp = func_to_pn(f);
+
+ if (intf == pn_control_intf_desc.bInterfaceNumber)
+ return 0;
+
+ if (intf == pn_data_intf_desc.bInterfaceNumber) {
+ struct phonet_port *port = netdev_priv(fp->dev);
+ u8 alt;
+
+ spin_lock(&port->lock);
+ alt = port->usb != NULL;
+ spin_unlock(&port->lock);
+ return alt;
+ }
+
+ return -EINVAL;
+}
+
+static void pn_disconnect(struct usb_function *f)
+{
+ struct f_phonet *fp = func_to_pn(f);
+ struct phonet_port *port = netdev_priv(fp->dev);
+ unsigned long flags;
+
+ /* remain disabled until set_alt */
+ spin_lock_irqsave(&port->lock, flags);
+ __pn_reset(f);
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static __init
+int pn_bind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct usb_composite_dev *cdev = c->cdev;
+ struct usb_gadget *gadget = cdev->gadget;
+ struct f_phonet *fp = func_to_pn(f);
+ struct usb_ep *ep;
+ int status, i;
+
+ /* Reserve interface IDs */
+ status = usb_interface_id(c, f);
+ if (status < 0)
+ goto err;
+ pn_control_intf_desc.bInterfaceNumber = status;
+ pn_union_desc.bMasterInterface0 = status;
+
+ status = usb_interface_id(c, f);
+ if (status < 0)
+ goto err;
+ pn_data_nop_intf_desc.bInterfaceNumber = status;
+ pn_data_intf_desc.bInterfaceNumber = status;
+ pn_union_desc.bSlaveInterface0 = status;
+
+ /* Reserve endpoints */
+ status = -ENODEV;
+ ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
+ if (!ep)
+ goto err;
+ fp->out_ep = ep;
+ ep->driver_data = fp; /* Claim */
+
+ ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
+ if (!ep)
+ goto err;
+ fp->in_ep = ep;
+ ep->driver_data = fp; /* Claim */
+
+ pn_hs_sink_desc.bEndpointAddress =
+ pn_fs_sink_desc.bEndpointAddress;
+ pn_hs_source_desc.bEndpointAddress =
+ pn_fs_source_desc.bEndpointAddress;
+
+ /* Do not try to bind Phonet twice... */
+ fp->function.descriptors = fs_pn_function;
+ fp->function.hs_descriptors = hs_pn_function;
+
+ /* Incoming USB requests */
+ status = -ENOMEM;
+ for (i = 0; i < phonet_rxq_size; i++) {
+ struct usb_request *req;
+
+ req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
+ if (!req)
+ goto err;
+
+ req->complete = pn_rx_complete;
+ fp->out_reqv[i] = req;
+ }
+
+ /* Outgoing USB requests */
+ fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
+ if (!fp->in_req)
+ goto err;
+
+ INFO(cdev, "USB CDC Phonet function\n");
+ INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
+ fp->out_ep->name, fp->in_ep->name);
+ return 0;
+
+err:
+ if (fp->out_ep)
+ fp->out_ep->driver_data = NULL;
+ if (fp->in_ep)
+ fp->in_ep->driver_data = NULL;
+ ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
+ return status;
+}
+
+static void
+pn_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct f_phonet *fp = func_to_pn(f);
+ int i;
+
+ /* We are already disconnected */
+ if (fp->in_req)
+ usb_ep_free_request(fp->in_ep, fp->in_req);
+ for (i = 0; i < phonet_rxq_size; i++)
+ if (fp->out_reqv[i])
+ usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
+
+ kfree(fp);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static struct net_device *dev;
+
+int __init phonet_bind_config(struct usb_configuration *c)
+{
+ struct f_phonet *fp;
+ int err;
+
+ fp = kzalloc(sizeof(*fp), GFP_KERNEL);
+ if (!fp)
+ return -ENOMEM;
+
+ fp->dev = dev;
+ fp->function.name = "phonet";
+ fp->function.bind = pn_bind;
+ fp->function.unbind = pn_unbind;
+ fp->function.set_alt = pn_set_alt;
+ fp->function.get_alt = pn_get_alt;
+ fp->function.disable = pn_disconnect;
+
+ err = usb_add_function(c, &fp->function);
+ if (err)
+ kfree(fp);
+ return err;
+}
+
+int __init gphonet_setup(struct usb_gadget *gadget)
+{
+ struct phonet_port *port;
+ int err;
+
+ /* Create net device */
+ BUG_ON(dev);
+ dev = alloc_netdev(sizeof(*port)
+ + (phonet_rxq_size * sizeof(struct usb_request *)),
+ "upnlink%d", pn_net_setup);
+ if (!dev)
+ return -ENOMEM;
+
+ port = netdev_priv(dev);
+ spin_lock_init(&port->lock);
+ netif_carrier_off(dev);
+ netif_stop_queue(dev);
+ SET_NETDEV_DEV(dev, &gadget->dev);
+
+ err = register_netdev(dev);
+ if (err)
+ free_netdev(dev);
+ return err;
+}
+
+void gphonet_cleanup(void)
+{
+ unregister_netdev(dev);
+}
projects / openwrt / staging / blogic.git / commitdiff