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usb: gadget: Standard ECM function driver for QCOM chipsets

Browse source 
New function driver to support Standard ECM with adaptions to
QCOM chipsets (Data path is over SPS BAM-to-BAM).
Standard ECM function was added to android gadget.

CRs-Fixed: 358338
Change-Id: Ic1ed2f7ee7ac50601ba5dc43d06c28bffe2c5c23
Signed-off-by: Ofir Cohen <ofirc@codeaurora.org>
This commit is contained in:
Ofir Cohen 2012-07-31 13:02:49 +03:00 committed by Stephen Boyd
parent ad115580e3
commit e15cc3c701
2 changed files with 961 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

92
drivers/usb/gadget/android.c
View file

@ -71,6 +71,8 @@
#include "u_ether.c"
#include "u_bam_data.c"
#include "f_mbim.c"
#include "f_qc_ecm.c"
#include "u_qc_ether.c"
#ifdef CONFIG_TARGET_CORE
#include "f_tcm.c"
#endif
@ -628,6 +630,95 @@ static struct android_usb_function rmnet_function = {
.attributes = rmnet_function_attributes,
};
struct ecm_function_config {
u8 ethaddr[ETH_ALEN];
};
static int ecm_function_init(struct android_usb_function *f,
struct usb_composite_dev *cdev)
{
f->config = kzalloc(sizeof(struct ecm_function_config), GFP_KERNEL);
if (!f->config)
return -ENOMEM;
return 0;
}
static void ecm_function_cleanup(struct android_usb_function *f)
{
kfree(f->config);
f->config = NULL;
}
static int ecm_qc_function_bind_config(struct android_usb_function *f,
struct usb_configuration *c)
{
int ret;
struct ecm_function_config *ecm = f->config;
if (!ecm) {
pr_err("%s: ecm_pdata\n", __func__);
return -EINVAL;
}
pr_info("%s MAC: %02X:%02X:%02X:%02X:%02X:%02X\n", __func__,
ecm->ethaddr[0], ecm->ethaddr[1], ecm->ethaddr[2],
ecm->ethaddr[3], ecm->ethaddr[4], ecm->ethaddr[5]);
ret = gether_qc_setup_name(c->cdev->gadget, ecm->ethaddr, "ecm");
if (ret) {
pr_err("%s: gether_setup failed\n", __func__);
return ret;
}
return ecm_qc_bind_config(c, ecm->ethaddr);
}
static void ecm_qc_function_unbind_config(struct android_usb_function *f,
struct usb_configuration *c)
{
gether_qc_cleanup();
}
static ssize_t ecm_ethaddr_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct android_usb_function *f = dev_get_drvdata(dev);
struct ecm_function_config *ecm = f->config;
return snprintf(buf, PAGE_SIZE, "%02x:%02x:%02x:%02x:%02x:%02x\n",
ecm->ethaddr[0], ecm->ethaddr[1], ecm->ethaddr[2],
ecm->ethaddr[3], ecm->ethaddr[4], ecm->ethaddr[5]);
}
static ssize_t ecm_ethaddr_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
struct android_usb_function *f = dev_get_drvdata(dev);
struct ecm_function_config *ecm = f->config;
if (sscanf(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n",
(int *)&ecm->ethaddr[0], (int *)&ecm->ethaddr[1],
(int *)&ecm->ethaddr[2], (int *)&ecm->ethaddr[3],
(int *)&ecm->ethaddr[4], (int *)&ecm->ethaddr[5]) == 6)
return size;
return -EINVAL;
}
static DEVICE_ATTR(ecm_ethaddr, S_IRUGO | S_IWUSR, ecm_ethaddr_show,
ecm_ethaddr_store);
static struct device_attribute *ecm_function_attributes[] = {
&dev_attr_ecm_ethaddr,
NULL
};
static struct android_usb_function ecm_qc_function = {
.name = "ecm_qc",
.init = ecm_function_init,
.cleanup = ecm_function_cleanup,
.bind_config = ecm_qc_function_bind_config,
.unbind_config = ecm_qc_function_unbind_config,
.attributes = ecm_function_attributes,
};
/* MBIM - used with BAM */
#define MAX_MBIM_INSTANCES 1
@ -1262,6 +1353,7 @@ static struct android_usb_function uasp_function = {
static struct android_usb_function *supported_functions[] = {
&mbim_function,
&ecm_qc_function,
&rmnet_smd_function,
&rmnet_sdio_function,
&rmnet_smd_sdio_function,

869
drivers/usb/gadget/f_qc_ecm.c Normal file
View file

@ -0,0 +1,869 @@
/*
* f_qc_ecm.c -- USB CDC Ethernet (ECM) link function driver
*
* Copyright (C) 2003-2005,2008 David Brownell
* Copyright (C) 2008 Nokia Corporation
* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* #define VERBOSE_DEBUG */
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include "u_ether.h"
#include "u_qc_ether.h"
/*
* This function is a "CDC Ethernet Networking Control Model" (CDC ECM)
* Ethernet link. The data transfer model is simple (packets sent and
* received over bulk endpoints using normal short packet termination),
* and the control model exposes various data and optional notifications.
*
* ECM is well standardized and (except for Microsoft) supported by most
* operating systems with USB host support. It's the preferred interop
* solution for Ethernet over USB, at least for firmware based solutions.
* (Hardware solutions tend to be more minimalist.) A newer and simpler
* "Ethernet Emulation Model" (CDC EEM) hasn't yet caught on.
*
* Note that ECM requires the use of "alternate settings" for its data
* interface. This means that the set_alt() method has real work to do,
* and also means that a get_alt() method is required.
*
* This function is based on USB CDC Ethernet link function driver and
* contains MSM specific implementation.
*/
enum ecm_qc_notify_state {
ECM_QC_NOTIFY_NONE, /* don't notify */
ECM_QC_NOTIFY_CONNECT, /* issue CONNECT next */
ECM_QC_NOTIFY_SPEED, /* issue SPEED_CHANGE next */
};
struct f_ecm_qc {
struct qc_gether port;
u8 ctrl_id, data_id;
char ethaddr[14];
struct usb_ep *notify;
struct usb_request *notify_req;
u8 notify_state;
bool is_open;
};
static inline struct f_ecm_qc *func_to_ecm_qc(struct usb_function *f)
{
return container_of(f, struct f_ecm_qc, port.func);
}
/* peak (theoretical) bulk transfer rate in bits-per-second */
static inline unsigned ecm_qc_bitrate(struct usb_gadget *g)
{
if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
return 13 * 512 * 8 * 1000 * 8;
else
return 19 * 64 * 1 * 1000 * 8;
}
/*-------------------------------------------------------------------------*/
/*
* Include the status endpoint if we can, even though it's optional.
*
* Use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
* packet, to simplify cancellation; and a big transfer interval, to
* waste less bandwidth.
*
* Some drivers (like Linux 2.4 cdc-ether!) "need" it to exist even
* if they ignore the connect/disconnect notifications that real aether
* can provide. More advanced cdc configurations might want to support
* encapsulated commands (vendor-specific, using control-OUT).
*/
#define ECM_QC_LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */
#define ECM_QC_STATUS_BYTECOUNT 16 /* 8 byte header + data */
/* currently only one std ecm instance is supported */
#define ECM_QC_NO_PORTS 1
/* interface descriptor: */
static struct usb_interface_descriptor ecm_qc_control_intf = {
.bLength = sizeof ecm_qc_control_intf,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
/* status endpoint is optional; this could be patched later */
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET,
.bInterfaceProtocol = USB_CDC_PROTO_NONE,
/* .iInterface = DYNAMIC */
};
static struct usb_cdc_header_desc ecm_qc_header_desc = {
.bLength = sizeof ecm_qc_header_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
.bcdCDC = cpu_to_le16(0x0110),
};
static struct usb_cdc_union_desc ecm_qc_union_desc = {
.bLength = sizeof(ecm_qc_union_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_UNION_TYPE,
/* .bMasterInterface0 = DYNAMIC */
/* .bSlaveInterface0 = DYNAMIC */
};
static struct usb_cdc_ether_desc ecm_qc_desc = {
.bLength = sizeof ecm_qc_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
/* this descriptor actually adds value, surprise! */
/* .iMACAddress = DYNAMIC */
.bmEthernetStatistics = cpu_to_le32(0), /* no statistics */
.wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN),
.wNumberMCFilters = cpu_to_le16(0),
.bNumberPowerFilters = 0,
};
/* the default data interface has no endpoints ... */
static struct usb_interface_descriptor ecm_qc_data_nop_intf = {
.bLength = sizeof ecm_qc_data_nop_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
/* .iInterface = DYNAMIC */
};
/* ... but the "real" data interface has two bulk endpoints */
static struct usb_interface_descriptor ecm_qc_data_intf = {
.bLength = sizeof ecm_qc_data_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 1,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
/* .iInterface = DYNAMIC */
};
/* full speed support: */
static struct usb_endpoint_descriptor ecm_qc_fs_notify_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(ECM_QC_STATUS_BYTECOUNT),
.bInterval = 1 << ECM_QC_LOG2_STATUS_INTERVAL_MSEC,
};
static struct usb_endpoint_descriptor ecm_qc_fs_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor ecm_qc_fs_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_descriptor_header *ecm_qc_fs_function[] = {
/* CDC ECM control descriptors */
(struct usb_descriptor_header *) &ecm_qc_control_intf,
(struct usb_descriptor_header *) &ecm_qc_header_desc,
(struct usb_descriptor_header *) &ecm_qc_union_desc,
(struct usb_descriptor_header *) &ecm_qc_desc,
/* NOTE: status endpoint might need to be removed */
(struct usb_descriptor_header *) &ecm_qc_fs_notify_desc,
/* data interface, altsettings 0 and 1 */
(struct usb_descriptor_header *) &ecm_qc_data_nop_intf,
(struct usb_descriptor_header *) &ecm_qc_data_intf,
(struct usb_descriptor_header *) &ecm_qc_fs_in_desc,
(struct usb_descriptor_header *) &ecm_qc_fs_out_desc,
NULL,
};
/* high speed support: */
static struct usb_endpoint_descriptor ecm_qc_hs_notify_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(ECM_QC_STATUS_BYTECOUNT),
.bInterval = ECM_QC_LOG2_STATUS_INTERVAL_MSEC + 4,
};
static struct usb_endpoint_descriptor ecm_qc_hs_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_endpoint_descriptor ecm_qc_hs_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_descriptor_header *ecm_qc_hs_function[] = {
/* CDC ECM control descriptors */
(struct usb_descriptor_header *) &ecm_qc_control_intf,
(struct usb_descriptor_header *) &ecm_qc_header_desc,
(struct usb_descriptor_header *) &ecm_qc_union_desc,
(struct usb_descriptor_header *) &ecm_qc_desc,
/* NOTE: status endpoint might need to be removed */
(struct usb_descriptor_header *) &ecm_qc_hs_notify_desc,
/* data interface, altsettings 0 and 1 */
(struct usb_descriptor_header *) &ecm_qc_data_nop_intf,
(struct usb_descriptor_header *) &ecm_qc_data_intf,
(struct usb_descriptor_header *) &ecm_qc_hs_in_desc,
(struct usb_descriptor_header *) &ecm_qc_hs_out_desc,
NULL,
};
/* string descriptors: */
static struct usb_string ecm_qc_string_defs[] = {
[0].s = "CDC Ethernet Control Model (ECM)",
[1].s = NULL /* DYNAMIC */,
[2].s = "CDC Ethernet Data",
{ } /* end of list */
};
static struct usb_gadget_strings ecm_qc_string_table = {
.language = 0x0409, /* en-us */
.strings = ecm_qc_string_defs,
};
static struct usb_gadget_strings *ecm_qc_strings[] = {
&ecm_qc_string_table,
NULL,
};
static struct data_port ecm_qc_bam_port;
static int ecm_qc_bam_setup(void)
{
int ret;
ret = bam_data_setup(ECM_QC_NO_PORTS);
if (ret) {
pr_err("bam_data_setup failed err: %d\n", ret);
return ret;
}
return 0;
}
static int ecm_qc_bam_connect(struct f_ecm_qc *dev)
{
int ret;
ecm_qc_bam_port.func = dev->port.func;
ecm_qc_bam_port.in = dev->port.in_ep;
ecm_qc_bam_port.out = dev->port.out_ep;
/* currently we use the first connection */
ret = bam_data_connect(&ecm_qc_bam_port, 0, 0);
if (ret) {
pr_err("bam_data_connect failed: err:%d\n",
ret);
return ret;
} else {
pr_info("ecm bam connected\n");
}
return 0;
}
static int ecm_qc_bam_disconnect(struct f_ecm_qc *dev)
{
pr_debug("dev:%p. %s Do nothing.\n",
dev, __func__);
return 0;
}
/*-------------------------------------------------------------------------*/
static void ecm_qc_do_notify(struct f_ecm_qc *ecm)
{
struct usb_request *req = ecm->notify_req;
struct usb_cdc_notification *event;
struct usb_composite_dev *cdev = ecm->port.func.config->cdev;
__le32 *data;
int status;
/* notification already in flight? */
if (!req)
return;
event = req->buf;
switch (ecm->notify_state) {
case ECM_QC_NOTIFY_NONE:
return;
case ECM_QC_NOTIFY_CONNECT:
event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
if (ecm->is_open)
event->wValue = cpu_to_le16(1);
else
event->wValue = cpu_to_le16(0);
event->wLength = 0;
req->length = sizeof *event;
DBG(cdev, "notify connect %s\n",
ecm->is_open ? "true" : "false");
ecm->notify_state = ECM_QC_NOTIFY_SPEED;
break;
case ECM_QC_NOTIFY_SPEED:
event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
event->wValue = cpu_to_le16(0);
event->wLength = cpu_to_le16(8);
req->length = ECM_QC_STATUS_BYTECOUNT;
/* SPEED_CHANGE data is up/down speeds in bits/sec */
data = req->buf + sizeof *event;
data[0] = cpu_to_le32(ecm_qc_bitrate(cdev->gadget));
data[1] = data[0];
DBG(cdev, "notify speed %d\n", ecm_qc_bitrate(cdev->gadget));
ecm->notify_state = ECM_QC_NOTIFY_NONE;
break;
}
event->bmRequestType = 0xA1;
event->wIndex = cpu_to_le16(ecm->ctrl_id);
ecm->notify_req = NULL;
status = usb_ep_queue(ecm->notify, req, GFP_ATOMIC);
if (status < 0) {
ecm->notify_req = req;
DBG(cdev, "notify --> %d\n", status);
}
}
static void ecm_qc_notify(struct f_ecm_qc *ecm)
{
/* NOTE on most versions of Linux, host side cdc-ethernet
* won't listen for notifications until its netdevice opens.
* The first notification then sits in the FIFO for a long
* time, and the second one is queued.
*/
ecm->notify_state = ECM_QC_NOTIFY_CONNECT;
ecm_qc_do_notify(ecm);
}
static void ecm_qc_notify_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_ecm_qc *ecm = req->context;
switch (req->status) {
case 0:
/* no fault */
break;
case -ECONNRESET:
case -ESHUTDOWN:
ecm->notify_state = ECM_QC_NOTIFY_NONE;
break;
default:
DBG(cdev, "event %02x --> %d\n",
event->bNotificationType, req->status);
break;
}
ecm->notify_req = req;
ecm_qc_do_notify(ecm);
}
static int ecm_qc_setup(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct f_ecm_qc *ecm = func_to_ecm_qc(f);
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = cdev->req;
int value = -EOPNOTSUPP;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
/* composite driver infrastructure handles everything except
* CDC class messages; interface activation uses set_alt().
*/
switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_SET_ETHERNET_PACKET_FILTER:
/* see 6.2.30: no data, wIndex = interface,
* wValue = packet filter bitmap
*/
if (w_length != 0 || w_index != ecm->ctrl_id)
goto invalid;
DBG(cdev, "packet filter %02x\n", w_value);
/* REVISIT locking of cdc_filter. This assumes the UDC
* driver won't have a concurrent packet TX irq running on
* another CPU; or that if it does, this write is atomic...
*/
ecm->port.cdc_filter = w_value;
value = 0;
break;
/* and optionally:
* case USB_CDC_SEND_ENCAPSULATED_COMMAND:
* case USB_CDC_GET_ENCAPSULATED_RESPONSE:
* case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
* case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
* case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
* case USB_CDC_GET_ETHERNET_STATISTIC:
*/
default:
invalid:
DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
}
/* respond with data transfer or status phase? */
if (value >= 0) {
DBG(cdev, "ecm req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
req->zero = 0;
req->length = value;
value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
if (value < 0)
pr_err("ecm req %02x.%02x response err %d\n",
ctrl->bRequestType, ctrl->bRequest,
value);
}
/* device either stalls (value < 0) or reports success */
return value;
}
static int ecm_qc_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
struct f_ecm_qc *ecm = func_to_ecm_qc(f);
struct usb_composite_dev *cdev = f->config->cdev;
/* Control interface has only altsetting 0 */
if (intf == ecm->ctrl_id) {
if (alt != 0)
goto fail;
if (ecm->notify->driver_data) {
VDBG(cdev, "reset ecm control %d\n", intf);
usb_ep_disable(ecm->notify);
}
if (!(ecm->notify->desc)) {
VDBG(cdev, "init ecm ctrl %d\n", intf);
if (config_ep_by_speed(cdev->gadget, f, ecm->notify))
goto fail;
}
usb_ep_enable(ecm->notify);
ecm->notify->driver_data = ecm;
/* Data interface has two altsettings, 0 and 1 */
} else if (intf == ecm->data_id) {
if (alt > 1)
goto fail;
if (ecm->port.in_ep->driver_data) {
DBG(cdev, "reset ecm\n");
gether_qc_disconnect(&ecm->port);
ecm_qc_bam_disconnect(ecm);
}
if (!ecm->port.in_ep->desc ||
!ecm->port.out_ep->desc) {
DBG(cdev, "init ecm\n");
if (config_ep_by_speed(cdev->gadget, f,
ecm->port.in_ep) ||
config_ep_by_speed(cdev->gadget, f,
ecm->port.out_ep)) {
ecm->port.in_ep->desc = NULL;
ecm->port.out_ep->desc = NULL;
goto fail;
}
}
/* CDC Ethernet only sends data in non-default altsettings.
* Changing altsettings resets filters, statistics, etc.
*/
if (alt == 1) {
struct net_device *net;
/* Enable zlps by default for ECM conformance;
* override for musb_hdrc (avoids txdma ovhead).
*/
ecm->port.is_zlp_ok = !(gadget_is_musbhdrc(cdev->gadget)
);
ecm->port.cdc_filter = DEFAULT_FILTER;
DBG(cdev, "activate ecm\n");
net = gether_qc_connect(&ecm->port);
if (IS_ERR(net))
return PTR_ERR(net);
if (ecm_qc_bam_connect(ecm))
goto fail;
}
/* NOTE this can be a minor disagreement with the ECM spec,
* which says speed notifications will "always" follow
* connection notifications. But we allow one connect to
* follow another (if the first is in flight), and instead
* just guarantee that a speed notification is always sent.
*/
ecm_qc_notify(ecm);
} else
goto fail;
return 0;
fail:
return -EINVAL;
}
/* Because the data interface supports multiple altsettings,
* this ECM function *MUST* implement a get_alt() method.
*/
static int ecm_qc_get_alt(struct usb_function *f, unsigned intf)
{
struct f_ecm_qc *ecm = func_to_ecm_qc(f);
if (intf == ecm->ctrl_id)
return 0;
return ecm->port.in_ep->driver_data ? 1 : 0;
}
static void ecm_qc_disable(struct usb_function *f)
{
struct f_ecm_qc *ecm = func_to_ecm_qc(f);
DBG(cdev, "ecm deactivated\n");
if (ecm->port.in_ep->driver_data) {
gether_qc_disconnect(&ecm->port);
ecm_qc_bam_disconnect(ecm);
}
if (ecm->notify->driver_data) {
usb_ep_disable(ecm->notify);
ecm->notify->driver_data = NULL;
ecm->notify->desc = NULL;
}
}
/*-------------------------------------------------------------------------*/
/*
* Callbacks let us notify the host about connect/disconnect when the
* net device is opened or closed.
*
* For testing, note that link states on this side include both opened
* and closed variants of:
*
* - disconnected/unconfigured
* - configured but inactive (data alt 0)
* - configured and active (data alt 1)
*
* Each needs to be tested with unplug, rmmod, SET_CONFIGURATION, and
* SET_INTERFACE (altsetting). Remember also that "configured" doesn't
* imply the host is actually polling the notification endpoint, and
* likewise that "active" doesn't imply it's actually using the data
* endpoints for traffic.
*/
static void ecm_qc_open(struct qc_gether *geth)
{
struct f_ecm_qc *ecm = func_to_ecm_qc(&geth->func);
DBG(ecm->port.func.config->cdev, "%s\n", __func__);
ecm->is_open = true;
ecm_qc_notify(ecm);
}
static void ecm_qc_close(struct qc_gether *geth)
{
struct f_ecm_qc *ecm = func_to_ecm_qc(&geth->func);
DBG(ecm->port.func.config->cdev, "%s\n", __func__);
ecm->is_open = false;
ecm_qc_notify(ecm);
}
/*-------------------------------------------------------------------------*/
/* ethernet function driver setup/binding */
static int
ecm_qc_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct f_ecm_qc *ecm = func_to_ecm_qc(f);
int status;
struct usb_ep *ep;
/* allocate instance-specific interface IDs */
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
ecm->ctrl_id = status;
ecm_qc_control_intf.bInterfaceNumber = status;
ecm_qc_union_desc.bMasterInterface0 = status;
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
ecm->data_id = status;
ecm_qc_data_nop_intf.bInterfaceNumber = status;
ecm_qc_data_intf.bInterfaceNumber = status;
ecm_qc_union_desc.bSlaveInterface0 = status;
status = -ENODEV;
/* allocate instance-specific endpoints */
ep = usb_ep_autoconfig(cdev->gadget, &ecm_qc_fs_in_desc);
if (!ep)
goto fail;
ecm->port.in_ep = ep;
ep->driver_data = cdev; /* claim */
ep = usb_ep_autoconfig(cdev->gadget, &ecm_qc_fs_out_desc);
if (!ep)
goto fail;
ecm->port.out_ep = ep;
ep->driver_data = cdev; /* claim */
/* NOTE: a status/notification endpoint is *OPTIONAL* but we
* don't treat it that way. It's simpler, and some newer CDC
* profiles (wireless handsets) no longer treat it as optional.
*/
ep = usb_ep_autoconfig(cdev->gadget, &ecm_qc_fs_notify_desc);
if (!ep)
goto fail;
ecm->notify = ep;
ep->driver_data = cdev; /* claim */
status = -ENOMEM;
/* allocate notification request and buffer */
ecm->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
if (!ecm->notify_req)
goto fail;
ecm->notify_req->buf = kmalloc(ECM_QC_STATUS_BYTECOUNT, GFP_KERNEL);
if (!ecm->notify_req->buf)
goto fail;
ecm->notify_req->context = ecm;
ecm->notify_req->complete = ecm_qc_notify_complete;
/* copy descriptors, and track endpoint copies */
f->descriptors = usb_copy_descriptors(ecm_qc_fs_function);
if (!f->descriptors)
goto fail;
/* support all relevant hardware speeds... we expect that when
* hardware is dual speed, all bulk-capable endpoints work at
* both speeds
*/
if (gadget_is_dualspeed(c->cdev->gadget)) {
ecm_qc_hs_in_desc.bEndpointAddress =
ecm_qc_fs_in_desc.bEndpointAddress;
ecm_qc_hs_out_desc.bEndpointAddress =
ecm_qc_fs_out_desc.bEndpointAddress;
ecm_qc_hs_notify_desc.bEndpointAddress =
ecm_qc_fs_notify_desc.bEndpointAddress;
/* copy descriptors, and track endpoint copies */
f->hs_descriptors = usb_copy_descriptors(ecm_qc_hs_function);
if (!f->hs_descriptors)
goto fail;
}
/* NOTE: all that is done without knowing or caring about
* the network link ... which is unavailable to this code
* until we're activated via set_alt().
*/
ecm->port.open = ecm_qc_open;
ecm->port.close = ecm_qc_close;
DBG(cdev, "CDC Ethernet: %s speed IN/%s OUT/%s NOTIFY/%s\n",
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
ecm->port.in_ep->name, ecm->port.out_ep->name,
ecm->notify->name);
return 0;
fail:
if (f->descriptors)
usb_free_descriptors(f->descriptors);
if (ecm->notify_req) {
kfree(ecm->notify_req->buf);
usb_ep_free_request(ecm->notify, ecm->notify_req);
}
/* we might as well release our claims on endpoints */
if (ecm->notify)
ecm->notify->driver_data = NULL;
if (ecm->port.out_ep->desc)
ecm->port.out_ep->driver_data = NULL;
if (ecm->port.in_ep->desc)
ecm->port.in_ep->driver_data = NULL;
pr_err("%s: can't bind, err %d\n", f->name, status);
return status;
}
static void
ecm_qc_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct f_ecm_qc *ecm = func_to_ecm_qc(f);
DBG(c->cdev, "ecm unbind\n");
if (gadget_is_dualspeed(c->cdev->gadget))
usb_free_descriptors(f->hs_descriptors);
usb_free_descriptors(f->descriptors);
kfree(ecm->notify_req->buf);
usb_ep_free_request(ecm->notify, ecm->notify_req);
ecm_qc_string_defs[1].s = NULL;
kfree(ecm);
}
/**
* ecm_qc_bind_config - add CDC Ethernet network link to a configuration
* @c: the configuration to support the network link
* @ethaddr: a buffer in which the ethernet address of the host side
* side of the link was recorded
* Context: single threaded during gadget setup
*
* Returns zero on success, else negative errno.
*
* Caller must have called @gether_qc_setup(). Caller is also responsible
* for calling @gether_cleanup() before module unload.
*/
int
ecm_qc_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
{
struct f_ecm_qc *ecm;
int status;
if (!can_support_ecm(c->cdev->gadget) || !ethaddr)
return -EINVAL;
status = ecm_qc_bam_setup();
if (status) {
pr_err("bam setup failed");
return status;
}
/* maybe allocate device-global string IDs */
if (ecm_qc_string_defs[0].id == 0) {
/* control interface label */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ecm_qc_string_defs[0].id = status;
ecm_qc_control_intf.iInterface = status;
/* data interface label */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ecm_qc_string_defs[2].id = status;
ecm_qc_data_intf.iInterface = status;
/* MAC address */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ecm_qc_string_defs[1].id = status;
ecm_qc_desc.iMACAddress = status;
}
/* allocate and initialize one new instance */
ecm = kzalloc(sizeof *ecm, GFP_KERNEL);
if (!ecm)
return -ENOMEM;
/* export host's Ethernet address in CDC format */
snprintf(ecm->ethaddr, sizeof ecm->ethaddr,
"%02X%02X%02X%02X%02X%02X",
ethaddr[0], ethaddr[1], ethaddr[2],
ethaddr[3], ethaddr[4], ethaddr[5]);
ecm_qc_string_defs[1].s = ecm->ethaddr;
ecm->port.cdc_filter = DEFAULT_FILTER;
ecm->port.func.name = "cdc_ethernet";
ecm->port.func.strings = ecm_qc_strings;
/* descriptors are per-instance copies */
ecm->port.func.bind = ecm_qc_bind;
ecm->port.func.unbind = ecm_qc_unbind;
ecm->port.func.set_alt = ecm_qc_set_alt;
ecm->port.func.get_alt = ecm_qc_get_alt;
ecm->port.func.setup = ecm_qc_setup;
ecm->port.func.disable = ecm_qc_disable;
status = usb_add_function(c, &ecm->port.func);
if (status) {
ecm_qc_string_defs[1].s = NULL;
kfree(ecm);
}
return status;
}