linux/drivers/net/usb/r8153_ecm.c
Leon Schuermann 2284bbd0cf r8153_ecm: Add Lenovo Powered USB-C Hub as a fallback of r8152
This commit enables the use of the r8153_ecm driver, introduced with
commit c1aedf015e ("net/usb/r8153_ecm: support ECM mode for
RTL8153") for the Lenovo Powered USB-C Hub (17ef:721e) based on the
Realtek RTL8153B chip.

This results in the following driver preference:

- if r8152 is available, use the r8152 driver
- if r8152 is not available, use the r8153_ecm driver

This is done to prevent the NIC from constantly sending pause frames
when the host system enters standby (fixed by using the r8152 driver
in "r8152: Add Lenovo Powered USB-C Travel Hub"), while still allowing
the device to work with the r8153_ecm driver as a fallback.

Signed-off-by: Leon Schuermann <leon@is.currently.online>
Tested-by: Leon Schuermann <leon@is.currently.online>
Link: https://lore.kernel.org/r/20210111190312.12589-3-leon@is.currently.online
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-12 20:00:51 -08:00

171 lines
3.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/usb/usbnet.h>
#include <linux/usb/r8152.h>
#define OCP_BASE 0xe86c
static int pla_read_word(struct usbnet *dev, u16 index)
{
u16 byen = BYTE_EN_WORD;
u8 shift = index & 2;
__le32 tmp;
int ret;
if (shift)
byen <<= shift;
index &= ~3;
ret = usbnet_read_cmd(dev, RTL8152_REQ_GET_REGS, RTL8152_REQT_READ, index,
MCU_TYPE_PLA | byen, &tmp, sizeof(tmp));
if (ret < 0)
goto out;
ret = __le32_to_cpu(tmp);
ret >>= (shift * 8);
ret &= 0xffff;
out:
return ret;
}
static int pla_write_word(struct usbnet *dev, u16 index, u32 data)
{
u32 mask = 0xffff;
u16 byen = BYTE_EN_WORD;
u8 shift = index & 2;
__le32 tmp;
int ret;
data &= mask;
if (shift) {
byen <<= shift;
mask <<= (shift * 8);
data <<= (shift * 8);
}
index &= ~3;
ret = usbnet_read_cmd(dev, RTL8152_REQ_GET_REGS, RTL8152_REQT_READ, index,
MCU_TYPE_PLA | byen, &tmp, sizeof(tmp));
if (ret < 0)
goto out;
data |= __le32_to_cpu(tmp) & ~mask;
tmp = __cpu_to_le32(data);
ret = usbnet_write_cmd(dev, RTL8152_REQ_SET_REGS, RTL8152_REQT_WRITE, index,
MCU_TYPE_PLA | byen, &tmp, sizeof(tmp));
out:
return ret;
}
static int r8153_ecm_mdio_read(struct net_device *netdev, int phy_id, int reg)
{
struct usbnet *dev = netdev_priv(netdev);
int ret;
ret = pla_write_word(dev, OCP_BASE, 0xa000);
if (ret < 0)
goto out;
ret = pla_read_word(dev, 0xb400 + reg * 2);
out:
return ret;
}
static void r8153_ecm_mdio_write(struct net_device *netdev, int phy_id, int reg, int val)
{
struct usbnet *dev = netdev_priv(netdev);
int ret;
ret = pla_write_word(dev, OCP_BASE, 0xa000);
if (ret < 0)
return;
ret = pla_write_word(dev, 0xb400 + reg * 2, val);
}
static int r8153_bind(struct usbnet *dev, struct usb_interface *intf)
{
int status;
status = usbnet_cdc_bind(dev, intf);
if (status < 0)
return status;
dev->mii.dev = dev->net;
dev->mii.mdio_read = r8153_ecm_mdio_read;
dev->mii.mdio_write = r8153_ecm_mdio_write;
dev->mii.reg_num_mask = 0x1f;
dev->mii.supports_gmii = 1;
return status;
}
static const struct driver_info r8153_info = {
.description = "RTL8153 ECM Device",
.flags = FLAG_ETHER,
.bind = r8153_bind,
.unbind = usbnet_cdc_unbind,
.status = usbnet_cdc_status,
.manage_power = usbnet_manage_power,
};
static const struct usb_device_id products[] = {
/* Realtek RTL8153 Based USB 3.0 Ethernet Adapters */
{
USB_DEVICE_AND_INTERFACE_INFO(VENDOR_ID_REALTEK, 0x8153, USB_CLASS_COMM,
USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long)&r8153_info,
},
/* Lenovo Powered USB-C Travel Hub (4X90S92381, based on Realtek RTL8153) */
{
USB_DEVICE_AND_INTERFACE_INFO(VENDOR_ID_LENOVO, 0x721e, USB_CLASS_COMM,
USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long)&r8153_info,
},
{ }, /* END */
};
MODULE_DEVICE_TABLE(usb, products);
static int rtl8153_ecm_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
#if IS_REACHABLE(CONFIG_USB_RTL8152)
if (rtl8152_get_version(intf))
return -ENODEV;
#endif
return usbnet_probe(intf, id);
}
static struct usb_driver r8153_ecm_driver = {
.name = "r8153_ecm",
.id_table = products,
.probe = rtl8153_ecm_probe,
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.reset_resume = usbnet_resume,
.supports_autosuspend = 1,
.disable_hub_initiated_lpm = 1,
};
module_usb_driver(r8153_ecm_driver);
MODULE_AUTHOR("Hayes Wang");
MODULE_DESCRIPTION("Realtek USB ECM device");
MODULE_LICENSE("GPL");