drivers/net/usb/r8153_ecm.c

Source file repositories/reference/linux-study-clean/drivers/net/usb/r8153_ecm.c

File Facts

System
Linux kernel
Corpus path
drivers/net/usb/r8153_ecm.c
Extension
.c
Size
3995 bytes
Lines
177
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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;

Annotation

Implementation Notes