tiny4412 驱动 （3）网卡驱动移植
网卡驱动是后面驱动的基础
型号 DM9621
USB_HOST_ETHNET_DP1+ USB4604
USB_HOST_ETHNET_DP1- USB4604
其中USB4604有四路USB
一路接网卡DM9621， 一路引出标号USBH3， 另外两路USBH1heUSBH2,都是usb-typeA
对于USB4604
复位信号 ： GPM2_4_USBRST ， 接B35
XuhostDATA1 B59
XuhostSTROBE1 B57
相关驱动
drivers/usb/misc/usb4604.c
enum usb4604_mode {
USB4604_MODE_UNKNOWN,
USB4604_MODE_HUB,
USB4604_MODE_STANDBY,
};
#ifdef CONFIG_OF
static const struct of_device_id usb4604_of_match[] = {
{ .compatible = "smsc,usb4604" },
{}
};
MODULE_DEVICE_TABLE(of, usb4604_of_match);
#endif
static struct i2c_driver usb4604_i2c_driver = {
.driver = {
.name = "usb4604",
.pm = &usb4604_i2c_pm_ops,
.of_match_table = of_match_ptr(usb4604_of_match),
},
.probe = usb4604_i2c_probe,
.id_table = usb4604_id,
};
module_i2c_driver(usb4604_i2c_driver);注意这里没有使用module_init等来加载驱动，而是使用module_i2c_driver， 说明还需要IIC
根据网上资料把相同目录的drivers/usb/misc/usb3503.c移植过来就可以了
此外还有include/linux/platform_data/usb3503.h
cp include/linux/platform_data/usb3503.h include/linux/platform_data/usb4604.h
cp drivers/usb/misc/usb3503.c drivers/usb/misc/usb4604.cvim include/linux/platform_data/usb4604.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __USB4604_H__
#define __USB4604_H__
#define USB4604_I2C_NAME "usb4604"
#define USB4604_OFF_PORT1 (1 << 1)
#define USB4604_OFF_PORT2 (1 << 2)
#define USB6604_OFF_PORT3 (1 << 3)
enum usb4604_mode {
USB4604_MODE_UNKNOWN,
USB4604_MODE_HUB,
USB4604_MODE_STANDBY,
};
struct usb4604_platform_data {
enum usb4604_mode initial_mode;
u8 port_off_mask;
int gpio_intn;
int gpio_connect;
int gpio_reset;
};
#endifvim drivers/usb/misc/usb4604.c
// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for SMSC USB4604 USB 2.0 hub controller driver
*
* Copyright (c) 2012-2013 Dongjin Kim ([email protected])
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define USB4604_VIDL 0x00
#define USB4604_VIDM 0x01
#define USB4604_PIDL 0x02
#define USB4604_PIDM 0x03
#define USB4604_DIDL 0x04
#define USB4604_DIDM 0x05
#define USB4604_CFG1 0x06
#define USB4604_SELF_BUS_PWR (1 << 7)
#define USB4604_CFG2 0x07
#define USB4604_CFG3 0x08
#define USB4604_NRD 0x09
#define USB4604_PDS 0x0a
#define USB4604_SP_ILOCK 0xe7
#define USB4604_SPILOCK_CONNECT (1 << 1)
#define USB4604_SPILOCK_CONFIG (1 << 0)
#define USB4604_CFGP 0xee
#define USB4604_CLKSUSP (1 << 7)
#define USB4604_RESET 0xff
struct usb4604 {
enum usb4604_mode mode;
struct regmap *regmap;
struct device *dev;
struct clk *clk;
u8 port_off_mask;
int gpio_intn;
int gpio_reset;
int gpio_connect;
bool secondary_ref_clk;
};
static int usb4604_reset(struct usb4604 *hub, int state)
{
if (!state && gpio_is_valid(hub->gpio_connect))
gpio_set_value_cansleep(hub->gpio_connect, 0);
if (gpio_is_valid(hub->gpio_reset))
gpio_set_value_cansleep(hub->gpio_reset, state);
/* Wait T_HUBINIT == 4ms for hub logic to stabilize */
if (state)
usleep_range(4000, 10000);
return 0;
}
static int usb4604_connect(struct usb4604 *hub)
{
struct device *dev = hub->dev;
int err;
usb4604_reset(hub, 1);
if (hub->regmap) {
/* SP_ILOCK: set connect_n, config_n for config */
err = regmap_write(hub->regmap, USB4604_SP_ILOCK,
(USB4604_SPILOCK_CONNECT
| USB4604_SPILOCK_CONFIG));
if (err < 0) {
dev_err(dev, "SP_ILOCK failed (%d)\n", err);
return err;
}
/* PDS : Set the ports which are disabled in self-powered mode. */
if (hub->port_off_mask) {
err = regmap_update_bits(hub->regmap, USB4604_PDS,
hub->port_off_mask,
hub->port_off_mask);
if (err < 0) {
dev_err(dev, "PDS failed (%d)\n", err);
return err;
}
}
/* CFG1 : Set SELF_BUS_PWR, this enables self-powered operation. */
err = regmap_update_bits(hub->regmap, USB4604_CFG1,
USB4604_SELF_BUS_PWR,
USB4604_SELF_BUS_PWR);
if (err < 0) {
dev_err(dev, "CFG1 failed (%d)\n", err);
return err;
}
/* SP_LOCK: clear connect_n, config_n for hub connect */
err = regmap_update_bits(hub->regmap, USB4604_SP_ILOCK,
(USB4604_SPILOCK_CONNECT
| USB4604_SPILOCK_CONFIG), 0);
if (err < 0) {
dev_err(dev, "SP_ILOCK failed (%d)\n", err);
return err;
}
}
if (gpio_is_valid(hub->gpio_connect))
gpio_set_value_cansleep(hub->gpio_connect, 1);
hub->mode = USB4604_MODE_HUB;
dev_info(dev, "switched to HUB mode\n");
return 0;
}
static int usb4604_switch_mode(struct usb4604 *hub, enum usb4604_mode mode)
{
struct device *dev = hub->dev;
int err = 0;
switch (mode) {
case USB4604_MODE_HUB:
err = usb4604_connect(hub);
break;
case USB4604_MODE_STANDBY:
usb4604_reset(hub, 0);
dev_info(dev, "switched to STANDBY mode\n");
break;
default:
dev_err(dev, "unknown mode is requested\n");
err = -EINVAL;
break;
}
return err;
}
static const struct regmap_config usb4604_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = USB4604_RESET,
};
static int usb4604_probe(struct usb4604 *hub)
{
struct device *dev = hub->dev;
struct usb4604_platform_data *pdata = dev_get_platdata(dev);
struct device_node *np = dev->of_node;
int err;
u32 mode = USB4604_MODE_HUB;
const u32 *property;
int len;
if (pdata) {
hub->port_off_mask = pdata->port_off_mask;
hub->gpio_intn = pdata->gpio_intn;
hub->gpio_connect = pdata->gpio_connect;
hub->gpio_reset = pdata->gpio_reset;
hub->mode = pdata->initial_mode;
} else if (np) {
struct clk *clk;
u32 rate = 0;
hub->port_off_mask = 0;
if (!of_property_read_u32(np, "refclk-frequency", &rate)) {
switch (rate) {
case 38400000:
case 26000000:
case 19200000:
case 12000000:
hub->secondary_ref_clk = 0;
break;
case 24000000:
case 27000000:
case 25000000:
case 50000000:
hub->secondary_ref_clk = 1;
break;
default:
dev_err(dev,
"unsupported reference clock rate (%d)\n",
(int) rate);
return -EINVAL;
}
}
clk = devm_clk_get(dev, "refclk");
if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) {
dev_err(dev, "unable to request refclk (%ld)\n",
PTR_ERR(clk));
return PTR_ERR(clk);
}
if (!IS_ERR(clk)) {
hub->clk = clk;
if (rate != 0) {
err = clk_set_rate(hub->clk, rate);
if (err) {
dev_err(dev,
"unable to set reference clock rate to %d\n",
(int) rate);
return err;
}
}
err = clk_prepare_enable(hub->clk);
if (err) {
dev_err(dev,
"unable to enable reference clock\n");
return err;
}
}
property = of_get_property(np, "disabled-ports", &len);
if (property && (len / sizeof(u32)) > 0) {
int i;
for (i = 0; i < len / sizeof(u32); i++) {
u32 port = be32_to_cpu(property[i]);
if ((1 <= port) && (port <= 3))
hub->port_off_mask |= (1 << port);
}
}
hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0);
if (hub->gpio_intn == -EPROBE_DEFER)
return -EPROBE_DEFER;
hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0);
if (hub->gpio_connect == -EPROBE_DEFER)
return -EPROBE_DEFER;
hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
if (hub->gpio_reset == -EPROBE_DEFER)
return -EPROBE_DEFER;
of_property_read_u32(np, "initial-mode", &mode);
hub->mode = mode;
}
if (hub->port_off_mask && !hub->regmap)
dev_err(dev, "Ports disabled with no control interface\n");
if (gpio_is_valid(hub->gpio_intn)) {
int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW :
GPIOF_OUT_INIT_HIGH;
err = devm_gpio_request_one(dev, hub->gpio_intn, val,
"usb4604 intn");
if (err) {
dev_err(dev,
"unable to request GPIO %d as interrupt pin (%d)\n",
hub->gpio_intn, err);
return err;
}
}
if (gpio_is_valid(hub->gpio_connect)) {
err = devm_gpio_request_one(dev, hub->gpio_connect,
GPIOF_OUT_INIT_LOW, "usb4604 connect");
if (err) {
dev_err(dev,
"unable to request GPIO %d as connect pin (%d)\n",
hub->gpio_connect, err);
return err;
}
}
if (gpio_is_valid(hub->gpio_reset)) {
err = devm_gpio_request_one(dev, hub->gpio_reset,
GPIOF_OUT_INIT_LOW, "usb4604 reset");
/* Datasheet defines a hardware reset to be at least 100us */
usleep_range(100, 10000);
if (err) {
dev_err(dev,
"unable to request GPIO %d as reset pin (%d)\n",
hub->gpio_reset, err);
return err;
}
}
usb4604_switch_mode(hub, hub->mode);
dev_info(dev, "%s: probed in %s mode\n", __func__,
(hub->mode == USB4604_MODE_HUB) ? "hub" : "standby");
return 0;
}
static int usb4604_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct usb4604 *hub;
int err;
hub = devm_kzalloc(&i2c->dev, sizeof(struct usb4604), GFP_KERNEL);
if (!hub)
return -ENOMEM;
i2c_set_clientdata(i2c, hub);
hub->regmap = devm_regmap_init_i2c(i2c, &usb4604_regmap_config);
if (IS_ERR(hub->regmap)) {
err = PTR_ERR(hub->regmap);
dev_err(&i2c->dev, "Failed to initialise regmap: %d\n", err);
return err;
}
hub->dev = &i2c->dev;
return usb4604_probe(hub);
}
static int usb4604_i2c_remove(struct i2c_client *i2c)
{
struct usb4604 *hub;
hub = i2c_get_clientdata(i2c);
if (hub->clk)
clk_disable_unprepare(hub->clk);
return 0;
}
static int usb4604_platform_probe(struct platform_device *pdev)
{
struct usb4604 *hub;
hub = devm_kzalloc(&pdev->dev, sizeof(struct usb4604), GFP_KERNEL);
if (!hub)
return -ENOMEM;
hub->dev = &pdev->dev;
platform_set_drvdata(pdev, hub);
return usb4604_probe(hub);
}
static int usb4604_platform_remove(struct platform_device *pdev)
{
struct usb4604 *hub;
hub = platform_get_drvdata(pdev);
if (hub->clk)
clk_disable_unprepare(hub->clk);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int usb4604_i2c_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct usb4604 *hub = i2c_get_clientdata(client);
usb4604_switch_mode(hub, USB4604_MODE_STANDBY);
if (hub->clk)
clk_disable_unprepare(hub->clk);
return 0;
}
static int usb4604_i2c_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct usb4604 *hub = i2c_get_clientdata(client);
if (hub->clk)
clk_prepare_enable(hub->clk);
usb4604_switch_mode(hub, hub->mode);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(usb4604_i2c_pm_ops, usb4604_i2c_suspend,
usb4604_i2c_resume);
static const struct i2c_device_id usb4604_id[] = {
{ USB4604_I2C_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, usb4604_id);
#ifdef CONFIG_OF
static const struct of_device_id usb4604_of_match[] = {
{ .compatible = "smsc,usb4604", },
{ .compatible = "smsc,usb4604a", },
{},
};
MODULE_DEVICE_TABLE(of, usb4604_of_match);
#endif
static struct i2c_driver usb4604_i2c_driver = {
.driver = {
.name = USB4604_I2C_NAME,
.pm = &usb4604_i2c_pm_ops,
.of_match_table = of_match_ptr(usb4604_of_match),
},
.probe = usb4604_i2c_probe,
.remove = usb4604_i2c_remove,
.id_table = usb4604_id,
};
static struct platform_driver usb4604_platform_driver = {
.driver = {
.name = USB4604_I2C_NAME,
.of_match_table = of_match_ptr(usb4604_of_match),
},
.probe = usb4604_platform_probe,
.remove = usb4604_platform_remove,
};
static int __init usb4604_init(void)
{
int err;
err = i2c_add_driver(&usb4604_i2c_driver);
if (err != 0)
pr_err("usb4604: Failed to register I2C driver: %d\n", err);
err = platform_driver_register(&usb4604_platform_driver);
if (err != 0)
pr_err("usb4604: Failed to register platform driver: %d\n",
err);
return 0;
}
module_init(usb4604_init);
static void __exit usb4604_exit(void)
{
platform_driver_unregister(&usb4604_platform_driver);
i2c_del_driver(&usb4604_i2c_driver);
}
module_exit(usb4604_exit);
MODULE_AUTHOR("Dongjin Kim ");
MODULE_DESCRIPTION("USB4604 USB HUB driver");
MODULE_LICENSE("GPL"); 配置
make menuconfig
Device Drivers --->
[*] USB support --->
<*> EHCI HCD (USB 2.0) support
<*> EHCI support for Samsung S5P/EXYNOS SoC Series
<*> USB Mass Storage support
<*> USB4604 HSIC to USB20 Driver设备树
vim arch/arm/boot/dts/exynos4412-tiny4412.dts
usb-hub {
compatible = "smsc,usb4604";
reset-gpios = <&gpm2 4 GPIO_ACTIVE_LOW>;
initial-mode = <1>;
status = "okay";
};
&exynos_usbphy {
status = "okay";
};
&ehci {
status = "okay";
port@0 {
status = "okay";
};
port@1 {
status = "okay";
};
port@2 {
status = "okay";
};
};
启动
[ 3.066663] dm9601 1-2.4:1.0 eth0: register 'dm9601' at usb-12580000.ehci-2.4, Davicom DM96xx USB 10/100 Ethernet, 00:00:ff:ff:00:00
[ 3.173493] usb 1-2.5: new high-speed USB device number 4 using exynos-ehci
[ 3.324602] usb 1-2.5: New USB device found, idVendor=0424, idProduct=2530, bcdDevice= 1.16
[ 3.324696] usb 1-2.5: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 3.324774] usb 1-2.5: Product: Bridge device
// insert U disk
[root@tiny4412 ]# [ 20.623748] usb 1-2.2: new high-speed USB device number 5 using exynos-ehci
[ 24.789022] usb 1-2.2: New USB device found, idVendor=0930, idProduct=6545, bcdDevice= 1.10
[ 24.789244] usb 1-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 24.789431] usb 1-2.2: Product: USB FLASH DRIVE
[ 24.789576] usb 1-2.2: Manufacturer: TOSHIBA
[ 24.791209] usb 1-2.2: SerialNumber: C03FD55EA867E161E00043A9
[ 24.804595] usb-storage 1-2.2:1.0: USB Mass Storage device detected
[ 24.817381] scsi host0: usb-storage 1-2.2:1.0
[ 25.857001] scsi 0:0:0:0: Direct-Access TOSHIBA USB FLASH DRIVE PMAP PQ: 0 ANSI: 6
[ 25.873663] sd 0:0:0:0: [sda] 60475392 512-byte logical blocks: (31.0 GB/28.8 GiB)
[ 25.874706] sd 0:0:0:0: [sda] Write Protect is off
[ 25.875015] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 25.875847] random: fast init done
[ 25.876123] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 27.953454] sda: sda4
[ 27.977744] sd 0:0:0:0: [sda] Attached SCSI removable disk分析
在drivers/usb/misc/usb4604.c里面
#ifdef CONFIG_OF
static const struct of_device_id usb4604_of_match[] = {
{ .compatible = "smsc,usb4604", },
{ .compatible = "smsc,usb4604a", },
{},
};
MODULE_DEVICE_TABLE(of, usb4604_of_match);
#endif所以设备树里面hub相关，compatible要匹配
usb-hub {
compatible = "smsc,usb4604"; #
reset-gpios = <&gpm2 4 GPIO_ACTIVE_LOW>;
initial-mode = <1>;
status = "okay";
};initial-mode = <1>;在代码里面有
enum usb4604_mode {
USB4604_MODE_UNKNOWN,
USB4604_MODE_HUB, // 可知是HUB
USB4604_MODE_STANDBY,
};NFS启动
make menuconfig
File systems --->
[*] Network File Systems --->
<*> NFS client support配置nfs目录
sudo vim /etc/exports
/home/flinn/tiny4412-SDK/tiny4412/fs/rootfs *(rw,sync,no_root_squash)/etc/init.d/nfs-kernel-server restart
设置启动参数
setenv ipaddr 192.168.1.123
setenv serverip 192.168.1.101
setenv bootargs noinitrd root=/dev/nfs rw nfsroot=192.168.1.101:/home/flinn/tiny4412-SDK/tiny4412/fs/rootfs ethmac=1C:6F:65:34:51:7E ip=192.168.1.123:192.168.1.101:192.168.1.1:255.255.255.0:TINY4412:eth0:off console=ttySAC0,115200 init=/linuxrc
usb start;tftp 0x40080000 uImage;tftp 0x42000000 exynos4412-tiny4412.dtb;bootm 0x40080000 - 0x42000000以上驱动有bug ！！！
以上原理图里面没有关于i2c的接口，而驱动usb3503里面有。
会出现什么问题呢？
[ 14.273539] Waiting up to 110 more seconds for network.
[ 24.293529] Waiting up to 100 more seconds for network.
...
经常出现等2分钟还没有启动。一直没有找到原因；后面仔细分析原理图，以及代码，发现设备树也没有给定i2c的地址，那么会不会在扫描到后才能执行后面的usb4604_probe，这样的话可以解释得通；
后面试了一下，直接去掉i2c相关，改成platform_driver，完美解决问题
/*
* Driver for SMSC USB4604 USB 2.0 hub controller driver
*
* Copyright (c) 2012-2013 Dongjin Kim ([email protected])
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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
*/
#include
#include
#include
#include
#include
#include
#define USB4604_NAME "usb4604"
enum usb4604_mode {
USB4604_MODE_UNKNOWN,
USB4604_MODE_HUB,
USB4604_MODE_STANDBY,
};
struct usb4604_platform_data {
enum usb4604_mode initial_mode;
int gpio_reset;
};
struct usb4604 {
enum usb4604_mode mode;
struct device *dev;
int gpio_reset;
};
static int usb4604_reset(struct usb4604 *hub, int state)
{
if (gpio_is_valid(hub->gpio_reset))
gpio_set_value_cansleep(hub->gpio_reset, state);
dev_info(hub->dev, "%s\n", __func__);
/* Wait T_HUBINIT == 1ms for hub logic to stabilize */
usleep_range(1000, 4000);
return 0;
}
static int usb4604_connect(struct usb4604 *hub)
{
struct device *dev = hub->dev;
int err;
dev_info(hub->dev, "%s\n", __func__);
usb4604_reset(hub, 1);
hub->mode = USB4604_MODE_HUB;
dev_info(dev, "switched to HUB mode\n");
return 0;
}
static int usb4604_switch_mode(struct usb4604 *hub, enum usb4604_mode mode)
{
struct device *dev = hub->dev;
int err = 0;
dev_info(hub->dev, "%s: mode:%d\n", __func__,mode);
switch (mode) {
case USB4604_MODE_HUB:
/*
* 1. reset usb4604 first
* 2. switch to HUB mode
*/
usb4604_reset(hub, 0);
err = usb4604_connect(hub);
break;
case USB4604_MODE_STANDBY:
usb4604_reset(hub, 0);
dev_info(dev, "switched to STANDBY mode\n");
break;
default:
dev_err(dev, "unknown mode is requested\n");
err = -EINVAL;
break;
}
return err;
}
static int usb4604_probe(struct usb4604 *hub)
{
struct device *dev = hub->dev;
struct usb4604_platform_data *pdata = dev_get_platdata(dev);
struct device_node *np = dev->of_node;
int err;
u32 mode = USB4604_MODE_HUB;
if (pdata) {
hub->gpio_reset = pdata->gpio_reset;
hub->mode = pdata->initial_mode;
} else if (np) {
hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
if(-EPROBE_DEFER == hub->gpio_reset)
return -EPROBE_DEFER;
of_property_read_u32(np, "initial-mode", &mode);
hub->mode = mode;
}
if (gpio_is_valid(hub->gpio_reset)) {
err = devm_gpio_request_one(dev, hub->gpio_reset,
GPIOF_OUT_INIT_LOW, "usb4604 reset");
if (err) {
dev_err(dev,
"unable to request GPIO %d as reset pin (%d)\n",
hub->gpio_reset, err);
return err;
}
}
usb4604_switch_mode(hub, hub->mode);
dev_info(dev, "%s: probed in %s mode\n", __func__,
(hub->mode == USB4604_MODE_HUB) ? "hub" : "standby");
return 0;
}
static int usb4604_platform_probe(struct platform_device *pdev)
{
struct usb4604 *hub;
hub = devm_kzalloc(&pdev->dev, sizeof(struct usb4604), GFP_KERNEL);
if (!hub)
return -ENOMEM;
hub->dev = &pdev->dev;
return usb4604_probe(hub);
}
#ifdef CONFIG_OF
static const struct of_device_id usb4604_of_match[] = {
{ .compatible = "smsc,usb4604", },
{},
};
MODULE_DEVICE_TABLE(of, usb4604_of_match);
#endif
static struct platform_driver usb4604_platform_driver = {
.driver = {
.name = USB4604_NAME,
.of_match_table = of_match_ptr(usb4604_of_match),
},
.probe = usb4604_platform_probe,
};
static int __init usb4604_init(void)
{
int err;
err = platform_driver_register(&usb4604_platform_driver);
if (err != 0)
pr_err("usb4604: Failed to register platform driver: %d\n",
err);
return 0;
}
module_init(usb4604_init);
static void __exit usb4604_exit(void)
{
platform_driver_unregister(&usb4604_platform_driver);
}
module_exit(usb4604_exit);
MODULE_DESCRIPTION("USB4604 USB HUB driver");
MODULE_LICENSE("GPL");