1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2015-2016 Russell King
14 #include <linux/mdio/mdio-i2c.h>
19  * I2C bus addresses 0x50 and 0x51 are normally an EEPROM, which is
21  * addresses 16 and 17.  Disallow access to these "phy" addresses.
35 	struct i2c_adapter *i2c = bus->priv;  in i2c_mii_read_default()
53 	msgs[0].len = p - addr;  in i2c_mii_read_default()
70 	struct i2c_adapter *i2c = bus->priv;  in i2c_mii_write_default()
89 	msg.len = p - data;  in i2c_mii_write_default()
102  * -------  ----  --------  -----------
122 			      int num)  in __i2c_transfer_err()  argument
126 	ret = __i2c_transfer(i2c, msgs, num);  in __i2c_transfer_err()
129 	else if (ret != num)  in __i2c_transfer_err()
130 		return -EIO;  in __i2c_transfer_err()
181  * unfortunately tests show that this does not work :-( Changed SFP_PAGE does
185 				 struct i2c_msg *msgs, int num)  in i2c_transfer_rollball()  argument
193 	ret = __i2c_rollball_get_page(i2c, msgs->addr, &saved_page);  in i2c_transfer_rollball()
198 	ret = __i2c_rollball_set_page(i2c, msgs->addr, SFP_PAGE_ROLLBALL_MDIO);  in i2c_transfer_rollball()
203 	ret = __i2c_transfer_err(i2c, msgs, num);  in i2c_transfer_rollball()
208 	ret = __i2c_rollball_set_page(i2c, msgs->addr, saved_page);  in i2c_transfer_rollball()
219 	struct i2c_adapter *i2c = bus->priv;  in i2c_rollball_mii_poll()
252 	} while (i-- > 0);  in i2c_rollball_mii_poll()
254 	dev_dbg(&bus->dev, "poll timed out\n");  in i2c_rollball_mii_poll()
256 	return -ETIMEDOUT;  in i2c_rollball_mii_poll()
262 	struct i2c_adapter *i2c = bus->priv;  in i2c_rollball_mii_cmd()
289 		return -EOPNOTSUPP;  in i2c_mii_read_rollball()
306 	if (ret == -ETIMEDOUT)  in i2c_mii_read_rollball()
323 		return -EOPNOTSUPP;  in i2c_mii_write_rollball()
369 		return -EIO;  in i2c_mii_init_rollball()
381 		return ERR_PTR(-EINVAL);  in mdio_i2c_alloc()
385 		return ERR_PTR(-ENOMEM);  in mdio_i2c_alloc()
387 	snprintf(mii->id, MII_BUS_ID_SIZE, "i2c:%s", dev_name(parent));  in mdio_i2c_alloc()
388 	mii->parent = parent;  in mdio_i2c_alloc()
389 	mii->priv = i2c;  in mdio_i2c_alloc()
402 		mii->read = i2c_mii_read_rollball;  in mdio_i2c_alloc()
403 		mii->write = i2c_mii_write_rollball;  in mdio_i2c_alloc()
406 		mii->read = i2c_mii_read_default;  in mdio_i2c_alloc()
407 		mii->write = i2c_mii_write_default;  in mdio_i2c_alloc()