1 // SPDX-License-Identifier: GPL-2.0
3  * MDIO I2C bridge
5  * Copyright (C) 2015-2016 Russell King
7  * Network PHYs can appear on I2C buses when they are part of SFP module.
12 #include <linux/i2c.h>
13 #include <linux/mdio/mdio-i2c.h>
17  * I2C bus addresses 0x50 and 0x51 are normally an EEPROM, which is
33 	struct i2c_adapter *i2c = bus->priv;  in i2c_mii_read()  local
51 	msgs[0].len = p - addr;  in i2c_mii_read()
58 	ret = i2c_transfer(i2c, msgs, ARRAY_SIZE(msgs));  in i2c_mii_read()
67 	struct i2c_adapter *i2c = bus->priv;  in i2c_mii_write()  local
86 	msg.len = p - data;  in i2c_mii_write()
89 	ret = i2c_transfer(i2c, &msg, 1);  in i2c_mii_write()
94 struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c)  in mdio_i2c_alloc()  argument
98 	if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))  in mdio_i2c_alloc()
99 		return ERR_PTR(-EINVAL);  in mdio_i2c_alloc()
103 		return ERR_PTR(-ENOMEM);  in mdio_i2c_alloc()
105 	snprintf(mii->id, MII_BUS_ID_SIZE, "i2c:%s", dev_name(parent));  in mdio_i2c_alloc()
106 	mii->parent = parent;  in mdio_i2c_alloc()
107 	mii->read = i2c_mii_read;  in mdio_i2c_alloc()
108 	mii->write = i2c_mii_write;  in mdio_i2c_alloc()
109 	mii->priv = i2c;  in mdio_i2c_alloc()
116 MODULE_DESCRIPTION("MDIO I2C bridge library");