172 lines
4.1 KiB
C
172 lines
4.1 KiB
C
/* Framework for MDIO devices, other than PHYs.
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*
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* Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mdio.h>
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#include <linux/mii.h>
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#include <linux/module.h>
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#include <linux/phy.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/unistd.h>
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void mdio_device_free(struct mdio_device *mdiodev)
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{
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put_device(&mdiodev->dev);
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}
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EXPORT_SYMBOL(mdio_device_free);
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static void mdio_device_release(struct device *dev)
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{
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kfree(to_mdio_device(dev));
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}
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struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr)
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{
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struct mdio_device *mdiodev;
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/* We allocate the device, and initialize the default values */
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mdiodev = kzalloc(sizeof(*mdiodev), GFP_KERNEL);
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if (!mdiodev)
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return ERR_PTR(-ENOMEM);
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mdiodev->dev.release = mdio_device_release;
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mdiodev->dev.parent = &bus->dev;
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mdiodev->dev.bus = &mdio_bus_type;
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mdiodev->device_free = mdio_device_free;
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mdiodev->device_remove = mdio_device_remove;
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mdiodev->bus = bus;
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mdiodev->addr = addr;
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dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr);
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device_initialize(&mdiodev->dev);
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return mdiodev;
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}
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EXPORT_SYMBOL(mdio_device_create);
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/**
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* mdio_device_register - Register the mdio device on the MDIO bus
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* @mdiodev: mdio_device structure to be added to the MDIO bus
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*/
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int mdio_device_register(struct mdio_device *mdiodev)
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{
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int err;
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dev_info(&mdiodev->dev, "mdio_device_register\n");
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err = mdiobus_register_device(mdiodev);
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if (err)
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return err;
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err = device_add(&mdiodev->dev);
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if (err) {
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pr_err("MDIO %d failed to add\n", mdiodev->addr);
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goto out;
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}
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return 0;
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out:
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mdiobus_unregister_device(mdiodev);
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return err;
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}
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EXPORT_SYMBOL(mdio_device_register);
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/**
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* mdio_device_remove - Remove a previously registered mdio device from the
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* MDIO bus
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* @mdiodev: mdio_device structure to remove
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*
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* This doesn't free the mdio_device itself, it merely reverses the effects
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* of mdio_device_register(). Use mdio_device_free() to free the device
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* after calling this function.
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*/
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void mdio_device_remove(struct mdio_device *mdiodev)
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{
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device_del(&mdiodev->dev);
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mdiobus_unregister_device(mdiodev);
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}
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EXPORT_SYMBOL(mdio_device_remove);
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/**
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* mdio_probe - probe an MDIO device
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* @dev: device to probe
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*
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* Description: Take care of setting up the mdio_device structure
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* and calling the driver to probe the device.
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*/
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static int mdio_probe(struct device *dev)
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{
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struct mdio_device *mdiodev = to_mdio_device(dev);
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struct device_driver *drv = mdiodev->dev.driver;
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struct mdio_driver *mdiodrv = to_mdio_driver(drv);
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int err = 0;
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if (mdiodrv->probe)
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err = mdiodrv->probe(mdiodev);
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return err;
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}
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static int mdio_remove(struct device *dev)
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{
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struct mdio_device *mdiodev = to_mdio_device(dev);
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struct device_driver *drv = mdiodev->dev.driver;
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struct mdio_driver *mdiodrv = to_mdio_driver(drv);
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if (mdiodrv->remove)
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mdiodrv->remove(mdiodev);
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return 0;
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}
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/**
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* mdio_driver_register - register an mdio_driver with the MDIO layer
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* @new_driver: new mdio_driver to register
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*/
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int mdio_driver_register(struct mdio_driver *drv)
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{
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struct mdio_driver_common *mdiodrv = &drv->mdiodrv;
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int retval;
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pr_info("mdio_driver_register: %s\n", mdiodrv->driver.name);
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mdiodrv->driver.bus = &mdio_bus_type;
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mdiodrv->driver.probe = mdio_probe;
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mdiodrv->driver.remove = mdio_remove;
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retval = driver_register(&mdiodrv->driver);
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if (retval) {
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pr_err("%s: Error %d in registering driver\n",
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mdiodrv->driver.name, retval);
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return retval;
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}
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return 0;
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}
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EXPORT_SYMBOL(mdio_driver_register);
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void mdio_driver_unregister(struct mdio_driver *drv)
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{
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struct mdio_driver_common *mdiodrv = &drv->mdiodrv;
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driver_unregister(&mdiodrv->driver);
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}
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EXPORT_SYMBOL(mdio_driver_unregister);
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