[linux-block.git] / drivers / net / phy / fixed_phy.c

/*
 * Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
 *
 * Author: Vitaly Bordug <vbordug@ru.mvista.com>
 *         Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * Copyright (c) 2006-2007 MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/gpio.h>
#include <linux/seqlock.h>
#include <linux/idr.h>
#include <linux/netdevice.h>

#include "swphy.h"

struct fixed_mdio_bus {
	struct mii_bus *mii_bus;
	struct list_head phys;
};

struct fixed_phy {
	int addr;
	struct phy_device *phydev;
	seqcount_t seqcount;
	struct fixed_phy_status status;
	bool no_carrier;
	int (*link_update)(struct net_device *, struct fixed_phy_status *);
	struct list_head node;
	int link_gpio;
};

static struct platform_device *pdev;
static struct fixed_mdio_bus platform_fmb = {
	.phys = LIST_HEAD_INIT(platform_fmb.phys),
};

int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct phy_device *phydev = dev->phydev;
	struct fixed_phy *fp;

	if (!phydev || !phydev->mdio.bus)
		return -EINVAL;

	list_for_each_entry(fp, &fmb->phys, node) {
		if (fp->addr == phydev->mdio.addr) {
			fp->no_carrier = !new_carrier;
			return 0;
		}
	}
	return -EINVAL;
}
EXPORT_SYMBOL_GPL(fixed_phy_change_carrier);

static void fixed_phy_update(struct fixed_phy *fp)
{
	if (!fp->no_carrier && gpio_is_valid(fp->link_gpio))
		fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
}

static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
{
	struct fixed_mdio_bus *fmb = bus->priv;
	struct fixed_phy *fp;

	list_for_each_entry(fp, &fmb->phys, node) {
		if (fp->addr == phy_addr) {
			struct fixed_phy_status state;
			int s;

			do {
				s = read_seqcount_begin(&fp->seqcount);
				fp->status.link = !fp->no_carrier;
				/* Issue callback if user registered it. */
				if (fp->link_update) {
					fp->link_update(fp->phydev->attached_dev,
							&fp->status);
					fixed_phy_update(fp);
				}
				state = fp->status;
			} while (read_seqcount_retry(&fp->seqcount, s));

			return swphy_read_reg(reg_num, &state);
		}
	}

	return 0xFFFF;
}

static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
			    u16 val)
{
	return 0;
}

/*
 * If something weird is required to be done with link/speed,
 * network driver is able to assign a function to implement this.
 * May be useful for PHY's that need to be software-driven.
 */
int fixed_phy_set_link_update(struct phy_device *phydev,
			      int (*link_update)(struct net_device *,
						 struct fixed_phy_status *))
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp;

	if (!phydev || !phydev->mdio.bus)
		return -EINVAL;

	list_for_each_entry(fp, &fmb->phys, node) {
		if (fp->addr == phydev->mdio.addr) {
			fp->link_update = link_update;
			fp->phydev = phydev;
			return 0;
		}
	}

	return -ENOENT;
}
EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);

int fixed_phy_add(unsigned int irq, int phy_addr,
		  struct fixed_phy_status *status,
		  int link_gpio)
{
	int ret;
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp;

	ret = swphy_validate_state(status);
	if (ret < 0)
		return ret;

	fp = kzalloc(sizeof(*fp), GFP_KERNEL);
	if (!fp)
		return -ENOMEM;

	seqcount_init(&fp->seqcount);

	if (irq != PHY_POLL)
		fmb->mii_bus->irq[phy_addr] = irq;

	fp->addr = phy_addr;
	fp->status = *status;
	fp->link_gpio = link_gpio;

	if (gpio_is_valid(fp->link_gpio)) {
		ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
				       "fixed-link-gpio-link");
		if (ret)
			goto err_regs;
	}

	fixed_phy_update(fp);

	list_add_tail(&fp->node, &fmb->phys);

	return 0;

err_regs:
	kfree(fp);
	return ret;
}
EXPORT_SYMBOL_GPL(fixed_phy_add);

static DEFINE_IDA(phy_fixed_ida);

static void fixed_phy_del(int phy_addr)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp, *tmp;

	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
		if (fp->addr == phy_addr) {
			list_del(&fp->node);
			if (gpio_is_valid(fp->link_gpio))
				gpio_free(fp->link_gpio);
			kfree(fp);
			ida_simple_remove(&phy_fixed_ida, phy_addr);
			return;
		}
	}
}

struct phy_device *fixed_phy_register(unsigned int irq,
				      struct fixed_phy_status *status,
				      int link_gpio,
				      struct device_node *np)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct phy_device *phy;
	int phy_addr;
	int ret;

	if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED)
		return ERR_PTR(-EPROBE_DEFER);

	/* Get the next available PHY address, up to PHY_MAX_ADDR */
	phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
	if (phy_addr < 0)
		return ERR_PTR(phy_addr);

	ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
	if (ret < 0) {
		ida_simple_remove(&phy_fixed_ida, phy_addr);
		return ERR_PTR(ret);
	}

	phy = get_phy_device(fmb->mii_bus, phy_addr, false);
	if (IS_ERR(phy)) {
		fixed_phy_del(phy_addr);
		return ERR_PTR(-EINVAL);
	}

	/* propagate the fixed link values to struct phy_device */
	phy->link = status->link;
	if (status->link) {
		phy->speed = status->speed;
		phy->duplex = status->duplex;
		phy->pause = status->pause;
		phy->asym_pause = status->asym_pause;
	}

	of_node_get(np);
	phy->mdio.dev.of_node = np;
	phy->is_pseudo_fixed_link = true;

	switch (status->speed) {
	case SPEED_1000:
		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
				 phy->supported);
		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
				 phy->supported);
		/* fall through */
	case SPEED_100:
		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
				 phy->supported);
		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
				 phy->supported);
		/* fall through */
	case SPEED_10:
	default:
		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
				 phy->supported);
		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
				 phy->supported);
	}

	ret = phy_device_register(phy);
	if (ret) {
		phy_device_free(phy);
		of_node_put(np);
		fixed_phy_del(phy_addr);
		return ERR_PTR(ret);
	}

	return phy;
}
EXPORT_SYMBOL_GPL(fixed_phy_register);

void fixed_phy_unregister(struct phy_device *phy)
{
	phy_device_remove(phy);
	of_node_put(phy->mdio.dev.of_node);
	fixed_phy_del(phy->mdio.addr);
}
EXPORT_SYMBOL_GPL(fixed_phy_unregister);

static int __init fixed_mdio_bus_init(void)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	int ret;

	pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);

	fmb->mii_bus = mdiobus_alloc();
	if (fmb->mii_bus == NULL) {
		ret = -ENOMEM;
		goto err_mdiobus_reg;
	}

	snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
	fmb->mii_bus->name = "Fixed MDIO Bus";
	fmb->mii_bus->priv = fmb;
	fmb->mii_bus->parent = &pdev->dev;
	fmb->mii_bus->read = &fixed_mdio_read;
	fmb->mii_bus->write = &fixed_mdio_write;

	ret = mdiobus_register(fmb->mii_bus);
	if (ret)
		goto err_mdiobus_alloc;

	return 0;

err_mdiobus_alloc:
	mdiobus_free(fmb->mii_bus);
err_mdiobus_reg:
	platform_device_unregister(pdev);
	return ret;
}
module_init(fixed_mdio_bus_init);

static void __exit fixed_mdio_bus_exit(void)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp, *tmp;

	mdiobus_unregister(fmb->mii_bus);
	mdiobus_free(fmb->mii_bus);
	platform_device_unregister(pdev);

	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
		list_del(&fp->node);
		kfree(fp);
	}
	ida_destroy(&phy_fixed_ida);
}
module_exit(fixed_mdio_bus_exit);

MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
MODULE_AUTHOR("Vitaly Bordug");
MODULE_LICENSE("GPL");
Commit	Line	Data
11b0bacd	1	/*
a79d8e93	2	* Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
11b0bacd	3	*
a79d8e93 VB	4	* Author: Vitaly Bordug <vbordug@ru.mvista.com>
a79d8e93 VB	5	* Anton Vorontsov <avorontsov@ru.mvista.com>
11b0bacd	6	*
a79d8e93	7	* Copyright (c) 2006-2007 MontaVista Software, Inc.
11b0bacd VB	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
11b0bacd	13	*/
a79d8e93	14
11b0bacd	15	#include <linux/kernel.h>
11b0bacd	16	#include <linux/module.h>
a79d8e93 VB	17	#include <linux/platform_device.h>
a79d8e93 VB	18	#include <linux/list.h>
11b0bacd	19	#include <linux/mii.h>
11b0bacd	20	#include <linux/phy.h>
7c32f470	21	#include <linux/phy_fixed.h>
57401d5e	22	#include <linux/err.h>
5a0e3ad6	23	#include <linux/slab.h>
a7595121	24	#include <linux/of.h>
a5597008	25	#include <linux/gpio.h>
bf7afb29	26	#include <linux/seqlock.h>
69fc58a5	27	#include <linux/idr.h>
b3e5464e	28	#include <linux/netdevice.h>
11b0bacd	29
5ae68b0c RK	30	#include "swphy.h"
5ae68b0c RK	31
a79d8e93	32	struct fixed_mdio_bus {
298cf9be	33	struct mii_bus *mii_bus;
a79d8e93 VB	34	struct list_head phys;
a79d8e93 VB	35	};
11b0bacd	36
a79d8e93	37	struct fixed_phy {
9b744942	38	int addr;
a79d8e93	39	struct phy_device *phydev;
bf7afb29	40	seqcount_t seqcount;
a79d8e93	41	struct fixed_phy_status status;
b3e5464e	42	bool no_carrier;
a79d8e93 VB	43	int (link_update)(struct net_device , struct fixed_phy_status *);
a79d8e93 VB	44	struct list_head node;
a5597008	45	int link_gpio;
a79d8e93	46	};
7c32f470	47
a79d8e93 VB	48	static struct platform_device *pdev;
	49	static struct fixed_mdio_bus platform_fmb = {
	50	.phys = LIST_HEAD_INIT(platform_fmb.phys),
	51	};
7c32f470	52
b3e5464e JT	53	int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier)
	54	{
	55	struct fixed_mdio_bus *fmb = &platform_fmb;
	56	struct phy_device *phydev = dev->phydev;
	57	struct fixed_phy *fp;
	58
	59	if (!phydev \|\| !phydev->mdio.bus)
	60	return -EINVAL;
	61
	62	list_for_each_entry(fp, &fmb->phys, node) {
	63	if (fp->addr == phydev->mdio.addr) {
	64	fp->no_carrier = !new_carrier;
	65	return 0;
	66	}
	67	}
	68	return -EINVAL;
	69	}
	70	EXPORT_SYMBOL_GPL(fixed_phy_change_carrier);
	71
37688e3f	72	static void fixed_phy_update(struct fixed_phy *fp)
11b0bacd	73	{
b3e5464e	74	if (!fp->no_carrier && gpio_is_valid(fp->link_gpio))
a5597008	75	fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
11b0bacd VB	76	}
11b0bacd VB	77
9b744942	78	static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
11b0bacd	79	{
ec2a5652	80	struct fixed_mdio_bus *fmb = bus->priv;
a79d8e93 VB	81	struct fixed_phy *fp;
a79d8e93 VB	82
a79d8e93	83	list_for_each_entry(fp, &fmb->phys, node) {
9b744942	84	if (fp->addr == phy_addr) {
bf7afb29 RK	85	struct fixed_phy_status state;
	86	int s;
	87
	88	do {
	89	s = read_seqcount_begin(&fp->seqcount);
b3e5464e	90	fp->status.link = !fp->no_carrier;
bf7afb29 RK	91	/* Issue callback if user registered it. */
	92	if (fp->link_update) {
	93	fp->link_update(fp->phydev->attached_dev,
	94	&fp->status);
	95	fixed_phy_update(fp);
	96	}
	97	state = fp->status;
	98	} while (read_seqcount_retry(&fp->seqcount, s));
	99
	100	return swphy_read_reg(reg_num, &state);
7c32f470	101	}
a79d8e93	102	}
11b0bacd	103
a79d8e93	104	return 0xFFFF;
11b0bacd VB	105	}
11b0bacd VB	106
9b744942	107	static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
a79d8e93	108	u16 val)
11b0bacd	109	{
11b0bacd VB	110	return 0;
	111	}
	112
a79d8e93 VB	113	/*
	114	* If something weird is required to be done with link/speed,
	115	* network driver is able to assign a function to implement this.
	116	* May be useful for PHY's that need to be software-driven.
	117	*/
	118	int fixed_phy_set_link_update(struct phy_device *phydev,
	119	int (link_update)(struct net_device ,
	120	struct fixed_phy_status *))
11b0bacd	121	{
a79d8e93 VB	122	struct fixed_mdio_bus *fmb = &platform_fmb;
a79d8e93 VB	123	struct fixed_phy *fp;
11b0bacd	124
e5a03bfd	125	if (!phydev \|\| !phydev->mdio.bus)
a79d8e93	126	return -EINVAL;
11b0bacd	127
a79d8e93	128	list_for_each_entry(fp, &fmb->phys, node) {
e5a03bfd	129	if (fp->addr == phydev->mdio.addr) {
a79d8e93 VB	130	fp->link_update = link_update;
	131	fp->phydev = phydev;
	132	return 0;
	133	}
	134	}
11b0bacd	135
a79d8e93	136	return -ENOENT;
7c32f470	137	}
a79d8e93	138	EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
7c32f470	139
9b744942	140	int fixed_phy_add(unsigned int irq, int phy_addr,
a5597008 AL	141	struct fixed_phy_status *status,
a5597008 AL	142	int link_gpio)
11b0bacd	143	{
a79d8e93 VB	144	int ret;
	145	struct fixed_mdio_bus *fmb = &platform_fmb;
	146	struct fixed_phy *fp;
11b0bacd	147
68888ce0 RK	148	ret = swphy_validate_state(status);
	149	if (ret < 0)
	150	return ret;
	151
a79d8e93 VB	152	fp = kzalloc(sizeof(*fp), GFP_KERNEL);
	153	if (!fp)
	154	return -ENOMEM;
11b0bacd	155
bf7afb29 RK	156	seqcount_init(&fp->seqcount);
bf7afb29 RK	157
185be5ae RV	158	if (irq != PHY_POLL)
185be5ae RV	159	fmb->mii_bus->irq[phy_addr] = irq;
11b0bacd	160
9b744942	161	fp->addr = phy_addr;
a79d8e93	162	fp->status = *status;
a5597008 AL	163	fp->link_gpio = link_gpio;
	164
	165	if (gpio_is_valid(fp->link_gpio)) {
	166	ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
	167	"fixed-link-gpio-link");
	168	if (ret)
	169	goto err_regs;
	170	}
7c32f470	171
37688e3f	172	fixed_phy_update(fp);
11b0bacd	173
a79d8e93	174	list_add_tail(&fp->node, &fmb->phys);
7c32f470	175
a79d8e93	176	return 0;
11b0bacd	177
a79d8e93 VB	178	err_regs:
	179	kfree(fp);
	180	return ret;
	181	}
	182	EXPORT_SYMBOL_GPL(fixed_phy_add);
11b0bacd	183
69fc58a5 FF	184	static DEFINE_IDA(phy_fixed_ida);
69fc58a5 FF	185
5bcbe0f3	186	static void fixed_phy_del(int phy_addr)
a7595121 TP	187	{
	188	struct fixed_mdio_bus *fmb = &platform_fmb;
	189	struct fixed_phy fp, tmp;
	190
	191	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
	192	if (fp->addr == phy_addr) {
	193	list_del(&fp->node);
a5597008 AL	194	if (gpio_is_valid(fp->link_gpio))
a5597008 AL	195	gpio_free(fp->link_gpio);
a7595121	196	kfree(fp);
69fc58a5	197	ida_simple_remove(&phy_fixed_ida, phy_addr);
a7595121 TP	198	return;
	199	}
	200	}
	201	}
a7595121	202
fd2ef0ba PG	203	struct phy_device *fixed_phy_register(unsigned int irq,
fd2ef0ba PG	204	struct fixed_phy_status *status,
a5597008	205	int link_gpio,
fd2ef0ba	206	struct device_node *np)
a7595121 TP	207	{
	208	struct fixed_mdio_bus *fmb = &platform_fmb;
	209	struct phy_device *phy;
	210	int phy_addr;
	211	int ret;
	212
185be5ae RV	213	if (!fmb->mii_bus \|\| fmb->mii_bus->state != MDIOBUS_REGISTERED)
	214	return ERR_PTR(-EPROBE_DEFER);
	215
a7595121	216	/* Get the next available PHY address, up to PHY_MAX_ADDR */
69fc58a5 FF	217	phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
	218	if (phy_addr < 0)
	219	return ERR_PTR(phy_addr);
a7595121	220
bd1a05ee	221	ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
69fc58a5 FF	222	if (ret < 0) {
69fc58a5 FF	223	ida_simple_remove(&phy_fixed_ida, phy_addr);
fd2ef0ba	224	return ERR_PTR(ret);
69fc58a5	225	}
a7595121 TP	226
a7595121 TP	227	phy = get_phy_device(fmb->mii_bus, phy_addr, false);
4914a584	228	if (IS_ERR(phy)) {
a7595121	229	fixed_phy_del(phy_addr);
fd2ef0ba	230	return ERR_PTR(-EINVAL);
a7595121 TP	231	}
a7595121 TP	232
4b195360 MB	233	/* propagate the fixed link values to struct phy_device */
	234	phy->link = status->link;
	235	if (status->link) {
	236	phy->speed = status->speed;
	237	phy->duplex = status->duplex;
	238	phy->pause = status->pause;
	239	phy->asym_pause = status->asym_pause;
	240	}
	241
a7595121	242	of_node_get(np);
e5a03bfd	243	phy->mdio.dev.of_node = np;
5a11dd7d	244	phy->is_pseudo_fixed_link = true;
a7595121	245
34b31da4 AL	246	switch (status->speed) {
34b31da4 AL	247	case SPEED_1000:
3c1bcc86 AL	248	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
	249	phy->supported);
	250	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
	251	phy->supported);
	252	/* fall through */
34b31da4	253	case SPEED_100:
3c1bcc86 AL	254	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
	255	phy->supported);
	256	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
	257	phy->supported);
	258	/* fall through */
34b31da4 AL	259	case SPEED_10:
34b31da4 AL	260	default:
3c1bcc86 AL	261	linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
	262	phy->supported);
	263	linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
	264	phy->supported);
34b31da4 AL	265	}
34b31da4 AL	266
a7595121 TP	267	ret = phy_device_register(phy);
	268	if (ret) {
	269	phy_device_free(phy);
	270	of_node_put(np);
	271	fixed_phy_del(phy_addr);
fd2ef0ba	272	return ERR_PTR(ret);
a7595121 TP	273	}
a7595121 TP	274
fd2ef0ba	275	return phy;
a7595121	276	}
37e9a690	277	EXPORT_SYMBOL_GPL(fixed_phy_register);
a7595121	278
5bcbe0f3 AL	279	void fixed_phy_unregister(struct phy_device *phy)
	280	{
	281	phy_device_remove(phy);
13c9d934	282	of_node_put(phy->mdio.dev.of_node);
5bcbe0f3 AL	283	fixed_phy_del(phy->mdio.addr);
	284	}
	285	EXPORT_SYMBOL_GPL(fixed_phy_unregister);
	286
a79d8e93 VB	287	static int __init fixed_mdio_bus_init(void)
	288	{
	289	struct fixed_mdio_bus *fmb = &platform_fmb;
	290	int ret;
11b0bacd	291
a79d8e93	292	pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
b0c1638f FE	293	if (IS_ERR(pdev))
b0c1638f FE	294	return PTR_ERR(pdev);
11b0bacd	295
298cf9be LB	296	fmb->mii_bus = mdiobus_alloc();
	297	if (fmb->mii_bus == NULL) {
	298	ret = -ENOMEM;
	299	goto err_mdiobus_reg;
	300	}
11b0bacd	301
9e6c643b	302	snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
298cf9be	303	fmb->mii_bus->name = "Fixed MDIO Bus";
ec2a5652	304	fmb->mii_bus->priv = fmb;
298cf9be LB	305	fmb->mii_bus->parent = &pdev->dev;
	306	fmb->mii_bus->read = &fixed_mdio_read;
	307	fmb->mii_bus->write = &fixed_mdio_write;
298cf9be LB	308
298cf9be LB	309	ret = mdiobus_register(fmb->mii_bus);
a79d8e93	310	if (ret)
298cf9be	311	goto err_mdiobus_alloc;
11b0bacd	312
a79d8e93	313	return 0;
11b0bacd	314
298cf9be LB	315	err_mdiobus_alloc:
298cf9be LB	316	mdiobus_free(fmb->mii_bus);
a79d8e93 VB	317	err_mdiobus_reg:
a79d8e93 VB	318	platform_device_unregister(pdev);
a79d8e93 VB	319	return ret;
	320	}
	321	module_init(fixed_mdio_bus_init);
11b0bacd	322
a79d8e93 VB	323	static void __exit fixed_mdio_bus_exit(void)
	324	{
	325	struct fixed_mdio_bus *fmb = &platform_fmb;
651be3a2	326	struct fixed_phy fp, tmp;
11b0bacd	327
298cf9be LB	328	mdiobus_unregister(fmb->mii_bus);
298cf9be LB	329	mdiobus_free(fmb->mii_bus);
a79d8e93	330	platform_device_unregister(pdev);
11b0bacd	331
651be3a2	332	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
a79d8e93 VB	333	list_del(&fp->node);
a79d8e93 VB	334	kfree(fp);
7c32f470	335	}
69fc58a5	336	ida_destroy(&phy_fixed_ida);
11b0bacd	337	}
a79d8e93	338	module_exit(fixed_mdio_bus_exit);
11b0bacd	339
a79d8e93	340	MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
11b0bacd VB	341	MODULE_AUTHOR("Vitaly Bordug");
11b0bacd VB	342	MODULE_LICENSE("GPL");