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/*
* File Name : u_ncm.c
*
* ncm utilities for composite USB gadgets.
* This utilitie can support to connect head unit for mirror link
*
* Copyright (C) 2011 Samsung Electronics
* Author: SoonYong, Cho <soonyong.cho@samsung.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include "f_ncm.c"
/* Support dynamic tethering mode.
* if ncm_connect is true, device is received vendor specific request
* from head unit.
*/
static bool ncm_connect;
/* terminal version using vendor specific request */
u16 terminal_mode_version;
u16 terminal_mode_vendor_id;
struct ncm_function_config {
u8 ethaddr[ETH_ALEN];
};
static int ncm_function_init(struct android_usb_function *f,
struct usb_composite_dev *cdev)
{
f->config = kzalloc(sizeof(struct ncm_function_config), GFP_KERNEL);
return 0;
}
static void ncm_function_cleanup(struct android_usb_function *f)
{
kfree(f->config);
f->config = NULL;
}
static int ncm_function_bind_config(struct android_usb_function *f,
struct usb_configuration *c)
{
int ret;
int i;
char *src;
struct ncm_function_config *ncm = f->config;
if (!ncm) {
pr_err("%s: ncm_pdata\n", __func__);
return -1;
}
ncm = f->config;
if (!f->config)
return -ENOMEM;
for (i = 0; i < ETH_ALEN; i++)
ncm->ethaddr[i] = 0;
/* create a fake MAC address from our serial number.
* first byte is 0x02 to signify locally administered.
*/
ncm->ethaddr[0] = 0x02;
src = serial_string;
for (i = 0; (i < 256) && *src; i++) {
/* XOR the USB serial across the remaining bytes */
ncm->ethaddr[i % (ETH_ALEN - 1) + 1] ^= *src++;
}
printk(KERN_DEBUG "usb: %s MAC:%02X:%02X:%02X:%02X:%02X:%02X\n",
__func__, ncm->ethaddr[0], ncm->ethaddr[1],
ncm->ethaddr[2], ncm->ethaddr[3], ncm->ethaddr[4],
ncm->ethaddr[5]);
printk(KERN_DEBUG "usb: %s before MAC:%02X:%02X:%02X:%02X:%02X:%02X\n",
__func__, ncm->ethaddr[0], ncm->ethaddr[1],
ncm->ethaddr[2], ncm->ethaddr[3], ncm->ethaddr[4],
ncm->ethaddr[5]);
/* we have to use trick.
* rndis name will be used for ethernet interface name.
*/
ret = gether_setup_name(c->cdev->gadget, ncm->ethaddr, "rndis");
printk(KERN_DEBUG "usb: %s after MAC:%02X:%02X:%02X:%02X:%02X:%02X\n",
__func__, ncm->ethaddr[0], ncm->ethaddr[1],
ncm->ethaddr[2], ncm->ethaddr[3], ncm->ethaddr[4],
ncm->ethaddr[5]);
if (ret) {
pr_err("%s: gether_setup failed\n", __func__);
return ret;
}
return ncm_bind_config(c, ncm->ethaddr);
}
static void ncm_function_unbind_config(struct android_usb_function *f,
struct usb_configuration *c)
{
gether_cleanup();
}
static struct android_usb_function ncm_function = {
.name = "ncm",
.init = ncm_function_init,
.cleanup = ncm_function_cleanup,
.bind_config = ncm_function_bind_config,
.unbind_config = ncm_function_unbind_config,
};
bool is_ncm_ready(char *name)
{
/* Enable ncm function */
if (!strcmp(name, "rndis") || !strcmp(name, "ncm")) {
if (ncm_connect) {
printk(KERN_DEBUG "usb: %s ncm ready (%s)\n",
__func__, name);
return true;
}
}
return false;
}
void set_ncm_device_descriptor(struct usb_device_descriptor *desc)
{
desc->idProduct = 0x685d;
desc->bDeviceClass = USB_CLASS_COMM;
printk(KERN_DEBUG "usb: %s idProduct=0x%x, DeviceClass=0x%x\n",
__func__, desc->idProduct, desc->bDeviceClass);
}
void set_ncm_ready(bool ready)
{
if (ready != ncm_connect)
printk(KERN_DEBUG "usb: %s old status=%d, new status=%d\n",
__func__, ncm_connect, ready);
ncm_connect = ready;
if (ready == false) {
terminal_mode_version = 0;
terminal_mode_vendor_id = 0;
}
}
static ssize_t terminal_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
ret = sprintf(buf, "major %x minor %x vendor %x\n",
terminal_mode_version & 0xff,
(terminal_mode_version >> 8 & 0xff),
terminal_mode_vendor_id);
printk(KERN_DEBUG "usb: %s terminal_mode %s\n", __func__, buf);
return ret;
}
static ssize_t terminal_version_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
int value;
sscanf(buf, "%x", &value);
terminal_mode_version = (u16)value;
printk(KERN_DEBUG "usb: %s buf=%s\n", __func__, buf);
/* always set ncm ready */
set_ncm_ready(true);
return size;
}
static DEVICE_ATTR(terminal_version, S_IRUGO | S_IWUSR,
terminal_version_show, terminal_version_store);
static int create_terminal_attribute(struct device **pdev)
{
int err;
if (IS_ERR(*pdev)) {
printk(KERN_DEBUG "usb: %s error pdev(%p)\n",
__func__, *pdev);
return PTR_ERR(*pdev);
}
err = device_create_file(*pdev, &dev_attr_terminal_version);
if (err) {
printk(KERN_DEBUG "usb: %s failed to create attr\n",
__func__);
return err;
}
return 0;
}
static int terminal_ctrl_request(struct usb_composite_dev *cdev,
const struct usb_ctrlrequest *ctrl)
{
int value = -EOPNOTSUPP;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
/* Handle Terminal mode request */
if (ctrl->bRequest == 0xf0) {
terminal_mode_version = w_value;
terminal_mode_vendor_id = w_index;
set_ncm_ready(true);
printk(KERN_DEBUG "usb: %s ver=0x%x vendor_id=0x%x\n",
__func__, terminal_mode_version,
terminal_mode_vendor_id);
value = 0;
}
}
/* respond ZLP */
if (value >= 0) {
int rc;
cdev->req->zero = 0;
cdev->req->length = value;
rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
if (rc < 0)
printk(KERN_DEBUG "usb: %s failed usb_ep_queue\n",
__func__);
}
return value;
}
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