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.
36 	struct i2c_adapter *i2c = bus->priv;  in i2c_mii_read_default_c45()
54 	msgs[0].len = p - addr;  in i2c_mii_read_default_c45()
71 	struct i2c_adapter *i2c = bus->priv;  in i2c_mii_write_default_c45()
90 	msg.len = p - data;  in i2c_mii_write_default_c45()
100 	return i2c_mii_read_default_c45(bus, phy_id, -1, reg);  in i2c_mii_read_default_c22()
106 	return i2c_mii_write_default_c45(bus, phy_id, -1, reg, val);  in i2c_mii_write_default_c22()
114  * -------  ----  --------  -----------
134 			      int num)  in __i2c_transfer_err()  argument
138 	ret = __i2c_transfer(i2c, msgs, num);  in __i2c_transfer_err()
141 	else if (ret != num)  in __i2c_transfer_err()
142 		return -EIO;  in __i2c_transfer_err()
193  * unfortunately tests show that this does not work :-( Changed SFP_PAGE does
197 				 struct i2c_msg *msgs, int num)  in i2c_transfer_rollball()  argument
205 	ret = __i2c_rollball_get_page(i2c, msgs->addr, &saved_page);  in i2c_transfer_rollball()
210 	ret = __i2c_rollball_set_page(i2c, msgs->addr, SFP_PAGE_ROLLBALL_MDIO);  in i2c_transfer_rollball()
215 	ret = __i2c_transfer_err(i2c, msgs, num);  in i2c_transfer_rollball()
220 	ret = __i2c_rollball_set_page(i2c, msgs->addr, saved_page);  in i2c_transfer_rollball()
231 	struct i2c_adapter *i2c = bus->priv;  in i2c_rollball_mii_poll()
264 	} while (i-- > 0);  in i2c_rollball_mii_poll()
266 	dev_dbg(&bus->dev, "poll timed out\n");  in i2c_rollball_mii_poll()
268 	return -ETIMEDOUT;  in i2c_rollball_mii_poll()
274 	struct i2c_adapter *i2c = bus->priv;  in i2c_rollball_mii_cmd()
316 	if (ret == -ETIMEDOUT)  in i2c_mii_read_rollball()
376 		return -EIO;  in i2c_mii_init_rollball()
388 		return ERR_PTR(-EINVAL);  in mdio_i2c_alloc()
392 		return ERR_PTR(-ENOMEM);  in mdio_i2c_alloc()
394 	snprintf(mii->id, MII_BUS_ID_SIZE, "i2c:%s", dev_name(parent));  in mdio_i2c_alloc()
395 	mii->parent = parent;  in mdio_i2c_alloc()
396 	mii->priv = i2c;  in mdio_i2c_alloc()
409 		mii->read_c45 = i2c_mii_read_rollball;  in mdio_i2c_alloc()
410 		mii->write_c45 = i2c_mii_write_rollball;  in mdio_i2c_alloc()
413 		mii->read = i2c_mii_read_default_c22;  in mdio_i2c_alloc()
414 		mii->write = i2c_mii_write_default_c22;  in mdio_i2c_alloc()
415 		mii->read_c45 = i2c_mii_read_default_c45;  in mdio_i2c_alloc()
416 		mii->write_c45 = i2c_mii_write_default_c45;  in mdio_i2c_alloc()