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@@ -0,0 +1,621 @@
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+/*
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+ * f_phonet.c -- USB CDC Phonet function
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+ *
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+ * Copyright (C) 2007-2008 Nokia Corporation. All rights reserved.
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+ *
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+ * Author: Rémi Denis-Courmont
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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+ * 02110-1301 USA
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/device.h>
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+
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+#include <linux/netdevice.h>
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+#include <linux/if_ether.h>
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+#include <linux/if_phonet.h>
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+#include <linux/if_arp.h>
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+
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+#include <linux/usb/ch9.h>
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+#include <linux/usb/cdc.h>
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+#include <linux/usb/composite.h>
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+
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+#include "u_phonet.h"
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+
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+#define PN_MEDIA_USB 0x1B
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+
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+/*-------------------------------------------------------------------------*/
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+
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+struct phonet_port {
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+ struct f_phonet *usb;
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+ spinlock_t lock;
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+};
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+
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+struct f_phonet {
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+ struct usb_function function;
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+ struct net_device *dev;
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+ struct usb_ep *in_ep, *out_ep;
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+
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+ struct usb_request *in_req;
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+ struct usb_request *out_reqv[0];
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+};
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+
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+static int phonet_rxq_size = 2;
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+
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+static inline struct f_phonet *func_to_pn(struct usb_function *f)
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+{
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+ return container_of(f, struct f_phonet, function);
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+}
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+
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+/*-------------------------------------------------------------------------*/
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+
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+#define USB_CDC_SUBCLASS_PHONET 0xfe
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+#define USB_CDC_PHONET_TYPE 0xab
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+
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+static struct usb_interface_descriptor
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+pn_control_intf_desc = {
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+ .bLength = sizeof pn_control_intf_desc,
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+ .bDescriptorType = USB_DT_INTERFACE,
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+
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+ /* .bInterfaceNumber = DYNAMIC, */
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+ .bInterfaceClass = USB_CLASS_COMM,
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+ .bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET,
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+};
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+
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+static const struct usb_cdc_header_desc
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+pn_header_desc = {
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+ .bLength = sizeof pn_header_desc,
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+ .bDescriptorType = USB_DT_CS_INTERFACE,
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+ .bDescriptorSubType = USB_CDC_HEADER_TYPE,
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+ .bcdCDC = __constant_cpu_to_le16(0x0110),
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+};
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+
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+static const struct usb_cdc_header_desc
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+pn_phonet_desc = {
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+ .bLength = sizeof pn_phonet_desc,
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+ .bDescriptorType = USB_DT_CS_INTERFACE,
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+ .bDescriptorSubType = USB_CDC_PHONET_TYPE,
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+ .bcdCDC = __constant_cpu_to_le16(0x1505), /* ??? */
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+};
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+
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+static struct usb_cdc_union_desc
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+pn_union_desc = {
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+ .bLength = sizeof pn_union_desc,
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+ .bDescriptorType = USB_DT_CS_INTERFACE,
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+ .bDescriptorSubType = USB_CDC_UNION_TYPE,
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+
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+ /* .bMasterInterface0 = DYNAMIC, */
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+ /* .bSlaveInterface0 = DYNAMIC, */
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+};
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+
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+static struct usb_interface_descriptor
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+pn_data_nop_intf_desc = {
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+ .bLength = sizeof pn_data_nop_intf_desc,
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+ .bDescriptorType = USB_DT_INTERFACE,
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+
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+ /* .bInterfaceNumber = DYNAMIC, */
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+ .bAlternateSetting = 0,
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+ .bNumEndpoints = 0,
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+ .bInterfaceClass = USB_CLASS_CDC_DATA,
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+};
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+
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+static struct usb_interface_descriptor
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+pn_data_intf_desc = {
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+ .bLength = sizeof pn_data_intf_desc,
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+ .bDescriptorType = USB_DT_INTERFACE,
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+
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+ /* .bInterfaceNumber = DYNAMIC, */
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+ .bAlternateSetting = 1,
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+ .bNumEndpoints = 2,
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+ .bInterfaceClass = USB_CLASS_CDC_DATA,
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+};
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+
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+static struct usb_endpoint_descriptor
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+pn_fs_sink_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+
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+ .bEndpointAddress = USB_DIR_OUT,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+};
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+
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+static struct usb_endpoint_descriptor
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+pn_hs_sink_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+
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+ .bEndpointAddress = USB_DIR_OUT,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+ .wMaxPacketSize = __constant_cpu_to_le16(512),
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+};
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+
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+static struct usb_endpoint_descriptor
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+pn_fs_source_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+
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+ .bEndpointAddress = USB_DIR_IN,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+};
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+
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+static struct usb_endpoint_descriptor
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+pn_hs_source_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+
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+ .bEndpointAddress = USB_DIR_IN,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+ .wMaxPacketSize = __constant_cpu_to_le16(512),
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+};
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+
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+static struct usb_descriptor_header *fs_pn_function[] = {
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+ (struct usb_descriptor_header *) &pn_control_intf_desc,
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+ (struct usb_descriptor_header *) &pn_header_desc,
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+ (struct usb_descriptor_header *) &pn_phonet_desc,
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+ (struct usb_descriptor_header *) &pn_union_desc,
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+ (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
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+ (struct usb_descriptor_header *) &pn_data_intf_desc,
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+ (struct usb_descriptor_header *) &pn_fs_sink_desc,
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+ (struct usb_descriptor_header *) &pn_fs_source_desc,
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+ NULL,
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+};
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+
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+static struct usb_descriptor_header *hs_pn_function[] = {
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+ (struct usb_descriptor_header *) &pn_control_intf_desc,
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+ (struct usb_descriptor_header *) &pn_header_desc,
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+ (struct usb_descriptor_header *) &pn_phonet_desc,
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+ (struct usb_descriptor_header *) &pn_union_desc,
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+ (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
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+ (struct usb_descriptor_header *) &pn_data_intf_desc,
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+ (struct usb_descriptor_header *) &pn_hs_sink_desc,
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+ (struct usb_descriptor_header *) &pn_hs_source_desc,
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+ NULL,
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+};
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+
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+/*-------------------------------------------------------------------------*/
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+
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+static int pn_net_open(struct net_device *dev)
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+{
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+ if (netif_carrier_ok(dev))
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+ netif_wake_queue(dev);
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+ return 0;
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+}
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+
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+static int pn_net_close(struct net_device *dev)
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+{
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+ netif_stop_queue(dev);
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+ return 0;
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+}
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+
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+static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
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+{
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+ struct f_phonet *fp = ep->driver_data;
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+ struct net_device *dev = fp->dev;
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+ struct sk_buff *skb = req->context;
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+
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+ switch (req->status) {
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+ case 0:
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+ dev->stats.tx_packets++;
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+ dev->stats.tx_bytes += skb->len;
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+ break;
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+
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+ case -ESHUTDOWN: /* disconnected */
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+ case -ECONNRESET: /* disabled */
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+ dev->stats.tx_aborted_errors++;
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+ default:
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+ dev->stats.tx_errors++;
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+ }
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+
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+ dev_kfree_skb_any(skb);
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+ if (netif_carrier_ok(dev))
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+ netif_wake_queue(dev);
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+}
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+
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+static int pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
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+{
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+ struct phonet_port *port = netdev_priv(dev);
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+ struct f_phonet *fp;
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+ struct usb_request *req;
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+ unsigned long flags;
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+
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+ if (skb->protocol != htons(ETH_P_PHONET))
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+ goto out;
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+
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+ spin_lock_irqsave(&port->lock, flags);
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+ fp = port->usb;
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+ if (unlikely(!fp)) /* race with carrier loss */
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+ goto out_unlock;
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+
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+ req = fp->in_req;
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+ req->buf = skb->data;
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+ req->length = skb->len;
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+ req->complete = pn_tx_complete;
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+ req->zero = 1;
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+ req->context = skb;
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+
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+ if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
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+ goto out_unlock;
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+
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+ netif_stop_queue(dev);
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+ skb = NULL;
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+
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+out_unlock:
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+ spin_unlock_irqrestore(&port->lock, flags);
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+out:
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+ if (unlikely(skb)) {
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+ dev_kfree_skb_any(skb);
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+ dev->stats.tx_dropped++;
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+ }
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+ return 0;
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+}
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+
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+static int pn_net_mtu(struct net_device *dev, int new_mtu)
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+{
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+ struct phonet_port *port = netdev_priv(dev);
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+ unsigned long flags;
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+ int err = -EBUSY;
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+
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+ if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
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+ return -EINVAL;
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+
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+ spin_lock_irqsave(&port->lock, flags);
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+ if (!netif_carrier_ok(dev)) {
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+ dev->mtu = new_mtu;
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+ err = 0;
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+ }
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+ spin_unlock_irqrestore(&port->lock, flags);
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+ return err;
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+}
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+
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+static void pn_net_setup(struct net_device *dev)
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+{
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+ dev->features = 0;
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+ dev->type = ARPHRD_PHONET;
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+ dev->flags = IFF_POINTOPOINT | IFF_NOARP;
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+ dev->mtu = PHONET_DEV_MTU;
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+ dev->hard_header_len = 1;
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+ dev->dev_addr[0] = PN_MEDIA_USB;
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+ dev->addr_len = 1;
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+ dev->tx_queue_len = 1;
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+
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+ dev->destructor = free_netdev;
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+ dev->header_ops = &phonet_header_ops;
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+ dev->open = pn_net_open;
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+ dev->stop = pn_net_close;
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+ dev->hard_start_xmit = pn_net_xmit; /* mandatory */
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+ dev->change_mtu = pn_net_mtu;
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+}
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+
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+/*-------------------------------------------------------------------------*/
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+
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+/*
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+ * Queue buffer for data from the host
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+ */
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+static int
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+pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
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+{
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+ struct sk_buff *skb;
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+ const size_t size = fp->dev->mtu;
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+ int err;
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+
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+ skb = alloc_skb(size, gfp_flags);
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+ if (!skb)
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+ return -ENOMEM;
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+
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+ req->buf = skb->data;
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+ req->length = size;
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+ req->context = skb;
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+
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+ err = usb_ep_queue(fp->out_ep, req, gfp_flags);
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+ if (unlikely(err))
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+ dev_kfree_skb_any(skb);
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+ return err;
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+}
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+
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+static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
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+{
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+ struct f_phonet *fp = ep->driver_data;
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+ struct net_device *dev = fp->dev;
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+ struct sk_buff *skb = req->context;
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+ int status = req->status;
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+
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+ switch (status) {
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+ case 0:
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+ if (unlikely(!netif_running(dev)))
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+ break;
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+ if (unlikely(req->actual < 1))
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+ break;
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+ skb_put(skb, req->actual);
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+ skb->protocol = htons(ETH_P_PHONET);
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+ skb_reset_mac_header(skb);
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+ __skb_pull(skb, 1);
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+ skb->dev = dev;
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+ dev->stats.rx_packets++;
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+ dev->stats.rx_bytes += skb->len;
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+
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+ netif_rx(skb);
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+ skb = NULL;
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+ break;
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+
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+ /* Do not resubmit in these cases: */
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+ case -ESHUTDOWN: /* disconnect */
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+ case -ECONNABORTED: /* hw reset */
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+ case -ECONNRESET: /* dequeued (unlink or netif down) */
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+ req = NULL;
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+ break;
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+
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+ /* Do resubmit in these cases: */
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+ case -EOVERFLOW: /* request buffer overflow */
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+ dev->stats.rx_over_errors++;
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+ default:
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+ dev->stats.rx_errors++;
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+ break;
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+ }
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+
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+ if (skb)
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+ dev_kfree_skb_any(skb);
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+ if (req)
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+ pn_rx_submit(fp, req, GFP_ATOMIC);
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+}
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+
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+/*-------------------------------------------------------------------------*/
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+
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+static void __pn_reset(struct usb_function *f)
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+{
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+ struct f_phonet *fp = func_to_pn(f);
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+ struct net_device *dev = fp->dev;
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+ struct phonet_port *port = netdev_priv(dev);
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+
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+ netif_carrier_off(dev);
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+ netif_stop_queue(dev);
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+ port->usb = NULL;
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+
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+ usb_ep_disable(fp->out_ep);
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+ usb_ep_disable(fp->in_ep);
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+}
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+
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+static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
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+{
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+ struct f_phonet *fp = func_to_pn(f);
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+ struct usb_gadget *gadget = fp->function.config->cdev->gadget;
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+
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+ if (intf == pn_control_intf_desc.bInterfaceNumber)
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+ /* control interface, no altsetting */
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+ return (alt > 0) ? -EINVAL : 0;
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+
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+ if (intf == pn_data_intf_desc.bInterfaceNumber) {
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+ struct net_device *dev = fp->dev;
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+ struct phonet_port *port = netdev_priv(dev);
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+
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+ /* data intf (0: inactive, 1: active) */
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+ if (alt > 1)
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+ return -EINVAL;
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+
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+ spin_lock(&port->lock);
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+ __pn_reset(f);
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+ if (alt == 1) {
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+ struct usb_endpoint_descriptor *out, *in;
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+ int i;
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+
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|
|
+ 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);
|
|
|
+}
|