path: root/drivers/phy/phy-core.c

/*
 * phy-core.c  --  Generic Phy framework.
 *
 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
 *
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 *
 * 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/export.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/idr.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>

static struct class *phy_class;
static DEFINE_MUTEX(phy_provider_mutex);
static LIST_HEAD(phy_provider_list);
static LIST_HEAD(phys);
static DEFINE_IDA(phy_ida);

static void devm_phy_release(struct device *dev, void *res)
{
	struct phy *phy = *(struct phy **)res;

	phy_put(phy);
}

static void devm_phy_provider_release(struct device *dev, void *res)
{
	struct phy_provider *phy_provider = *(struct phy_provider **)res;

	of_phy_provider_unregister(phy_provider);
}

static void devm_phy_consume(struct device *dev, void *res)
{
	struct phy *phy = *(struct phy **)res;

	phy_destroy(phy);
}

static int devm_phy_match(struct device *dev, void *res, void *match_data)
{
	struct phy **phy = res;

	return *phy == match_data;
}

/**
 * phy_create_lookup() - allocate and register PHY/device association
 * @phy: the phy of the association
 * @con_id: connection ID string on device
 * @dev_id: the device of the association
 *
 * Creates and registers phy_lookup entry.
 */
int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id)
{
	struct phy_lookup *pl;

	if (!phy || !dev_id || !con_id)
		return -EINVAL;

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

	pl->dev_id = dev_id;
	pl->con_id = con_id;
	pl->phy = phy;

	mutex_lock(&phy_provider_mutex);
	list_add_tail(&pl->node, &phys);
	mutex_unlock(&phy_provider_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(phy_create_lookup);

/**
 * phy_remove_lookup() - find and remove PHY/device association
 * @phy: the phy of the association
 * @con_id: connection ID string on device
 * @dev_id: the device of the association
 *
 * Finds and unregisters phy_lookup entry that was created with
 * phy_create_lookup().
 */
void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id)
{
	struct phy_lookup *pl;

	if (!phy || !dev_id || !con_id)
		return;

	mutex_lock(&phy_provider_mutex);
	list_for_each_entry(pl, &phys, node)
		if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) &&
		    !strcmp(pl->con_id, con_id)) {
			list_del(&pl->node);
			kfree(pl);
			break;
		}
	mutex_unlock(&phy_provider_mutex);
}
EXPORT_SYMBOL_GPL(phy_remove_lookup);

static struct phy *phy_find(struct device *dev, const char *con_id)
{
	const char *dev_id = dev_name(dev);
	struct phy_lookup *p, *pl = NULL;

	mutex_lock(&phy_provider_mutex);
	list_for_each_entry(p, &phys, node)
		if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) {
			pl = p;
			break;
		}
	mutex_unlock(&phy_provider_mutex);

	return pl ? pl->phy : ERR_PTR(-ENODEV);
}

static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
{
	struct phy_provider *phy_provider;
	struct device_node *child;

	list_for_each_entry(phy_provider, &phy_provider_list, list) {
		if (phy_provider->dev->of_node == node)
			return phy_provider;

		for_each_child_of_node(phy_provider->children, child)
			if (child == node)
				return phy_provider;
	}

	return ERR_PTR(-EPROBE_DEFER);
}

int phy_pm_runtime_get(struct phy *phy)
{
	int ret;

	if (!phy)
		return 0;

	if (!pm_runtime_enabled(&phy->dev))
		return