// SPDX-License-Identifier: GPL-2.0-only
/*
* drivers/mfd/mfd-core.c
*
* core MFD support
* Copyright (c) 2006 Ian Molton
* Copyright (c) 2007,2008 Dmitry Baryshkov
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/list.h>
#include <linux/property.h>
#include <linux/mfd/core.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/regulator/consumer.h>
static LIST_HEAD(mfd_of_node_list);
struct mfd_of_node_entry {
struct list_head list;
struct device *dev;
struct device_node *np;
};
static const struct device_type mfd_dev_type = {
.name = "mfd_device",
};
#if IS_ENABLED(CONFIG_ACPI)
struct match_ids_walk_data {
struct acpi_device_id *ids;
struct acpi_device *adev;
};
static int match_device_ids(struct acpi_device *adev, void *data)
{
struct match_ids_walk_data *wd = data;
if (!acpi_match_device_ids(adev, wd->ids)) {
wd->adev = adev;
return 1;
}
return 0;
}
static void mfd_acpi_add_device(const struct mfd_cell *cell,
struct platform_device *pdev)
{
const struct mfd_cell_acpi_match *match = cell->acpi_match;
struct acpi_device *adev = NULL;
struct acpi_device *parent;
parent = ACPI_COMPANION(pdev->dev.parent);
if (!parent)
return;
/*
* MFD child device gets its ACPI handle either from the ACPI device
* directly under the parent that matches the either _HID or _CID, or
* _ADR or it will use the parent handle if is no ID is given.
*
* Note that use of _ADR is a grey area in the ACPI specification,
* though at least Intel Galileo Gen 2 is using it to distinguish
* the children devices.
*/
if (match) {
if (match->pnpid) {
struct acpi_device_id ids[2] = {};
struct match_ids_walk_data wd = {
.adev = NULL,
.ids = ids,
};
strscpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
acpi_dev_for_each_child(parent, match_device_ids, &wd);
adev = wd.adev;
} else {
adev = acpi_find_child_device(parent, match->adr, false);
}
}
device_set_node(&pdev->dev, acpi_fwnode_handle(adev ?: parent));
}
#else
static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
struct platform_device *pdev)
{
}
#endif
static int mfd_match_of_node_to_dev(struct platform_device *pdev,
struct device_node *np,
const struct mfd_cell *cell)
{
#if IS_ENABLED(CONFIG_OF)
struct mfd_of_node_entry *of_entry;
u64 of_node_addr;
/* Skip if OF node has previously been allocated to a device */
list_for_each_entry(of_entry, &mfd_of_node_list, list)
if (of_entry->np == np)
return -EAGAIN;
if (!cell->use_of_reg)
/* No of_reg defined - allocate first free compatible match */
goto allocate_of_node;
/* We only care about each node's first defined address */
if (of_property_read_reg(np, 0, &of_node_addr, NULL))
/* OF node does not contatin a 'reg' property to match to */
return -EAGAIN;
if (cell->of_reg != of_node_addr)
/* No match */
return -EAGAIN;
allocate_of_node:
of_entry = kzalloc(sizeof(*of_entry), GFP_KERNEL);
if (!of_entry)
return -ENOMEM;
of_entry->dev = &pdev->dev;
of_entry->np = np;
list_add_tail(&of_entry->list, &mfd_of_node_list);
device_set_node(&pdev->dev, of_fwnode_handle(np));
#endif
return 0;
}
static int mfd_add_device(struct device *parent, int id,
const struct mfd_cell *cell,
struct resource *mem_base,
int irq_base, struct irq_domain *domain)
{
struct resource *res;
struct platform_device *pdev;
struct device_node *np = NULL;
struct mfd_of_node_entry *of_entry, *tmp;
bool disabled = false;
int ret = -ENOMEM;
int platform_id;
int r;
if (id == PLATFORM_DEVID_AUTO)
platform_id = id;
else
platform_id = id + cell->id;
pdev = platform_device_alloc(cell->name, platform_id);
if (!pdev)
goto fail_alloc;
pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
if (!pdev->mfd_cell)
goto fail_device;
res = kcalloc(cell->num_resources, sizeof(*res), GFP_KERNEL);
if (!res)
goto fail_device;
pdev->dev.parent = parent;
pdev->dev.type = &mfd_dev_type;
pdev->dev.dma_mask = parent->dma_mask;
pdev->dev.dma_parms = parent->dma_parms;
pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
ret = regulator_bulk_register_supply_alias(
&pdev->dev, cell->parent_supplies,
parent, cell->parent_supplies,
cell->num_parent_supplies);
if (ret < 0)
goto fail_res;
if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell->of_compatible) {
for_each_child_of_node(parent->of_node, np) {
if (of_device_is_compatible(np, cell->of_compatible)) {
/* Skip 'disabled' devices */
if (!of_device_is_available(np)) {
disabled = true;
continue;
}
ret = mfd_match_of_node_to_dev(pdev, np, cell);
if (ret == -EAGAIN)
continue;
of_node_put(np);
if (ret)
goto fail_alias;
goto match;
}
}
if (disabled) {
/* Ignore 'disabled' devices error free */
ret = 0;
goto fail_alias;
}
match:
if (!pdev->dev.of_node)
pr_warn("%s: Failed to locate of_node [id: %d]\n",
cell->name, platform_id);
}
mfd_acpi_add_device(cell, pdev);
if (cell->pdata_size) {
ret = platform_device_add_data(pdev,
cell->platform_data, cell->pdata_size);
if (ret)
goto fail_of_entry;
}
if (cell->swnode) {
ret = device_add_software_node(&pdev->dev, cell->swnode);
if (ret)
goto fail_of_entry;
}
for (r = 0; r < cell->num_resources; r++) {
res[r].name = cell->resources[r].name;
res[r].flags = cell->resources[r].flags;
/* Find out base to use */
if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
res[r].parent = mem_base;
res[r].start = mem_base->start +
cell->resources[r].start;
res[r].end = mem_base->start +
cell->resources[r].end;
} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
if (domain) {
/* Unable to create mappings for IRQ ranges. */
WARN_ON(cell->resources[r].start !=
cell->resources[r].end);
res[r].start = res[r].end = irq_create_mapping(
domain, cell->resources[r].start);
} else {
res[r].start = irq_base +
cell->resources[r].start;
res[r].end = irq_base +
cell->resources[r].end;
}
} else {
res[r].parent = cell->resources[r].parent;
res[r].start = cell->resources[r].start;
res[r].end = cell->resources[r].end;
}
if (!cell->ignore_resource_conflicts) {
if (has_acpi_companion(&pdev->dev)) {
ret = acpi_check_resource_conflict(&res[r]);
if (ret)
goto fail_res_conflict;
}
}
}
ret = platform_device_add_resources(pdev, res, cell->num_resources);
if (ret)
goto fail_res_conflict;
ret = platform_device_add(pdev);
if (ret)
goto fail_res_conflict;
if (cell->pm_runtime_no_callbacks)
pm_runtime_no_callbacks(&pdev->dev);
kfree(res);
return 0;
fail_res_conflict:
if (cell->swnode)
device_remove_software_node(&pdev->dev);
fail_of_entry:
list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
if (of_entry->dev == &pdev->dev) {
list_del(&of_entry->list);
kfree(of_entry);
}
fail_alias:
regulator_bulk_unregister_supply_alias(&pdev->dev,
cell->parent_supplies,
cell->num_parent_supplies);
fail_res:
kfree(res);
fail_device:
platform_device_put(pdev);
fail_alloc:
return ret;
}
/**
* mfd_add_devices - register child devices
*
* @parent: Pointer to parent device.
* @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
* of device numbering, or will be added to a device's cell_id.
* @cells: Array of (struct mfd_cell)s describing child devices.
* @n_devs: Number of child devices to register.
* @mem_base: Parent register range resource for child devices.
* @irq_base: Base of the range of virtual interrupt numbers allocated for
* this MFD device. Unused if @domain is specified.
* @domain: Interrupt domain to create mappings for hardware interrupts.
*/
int mfd_add_devices(struct device *parent, int id,
const struct mfd_cell *cells, int n_devs,
struct resource *mem_base,
int irq_base, struct irq_domain *domain)
{
int i;
int ret;
for (i = 0; i < n_devs; i++) {
ret = mfd_add_device(parent, id, cells + i, mem_base,
irq_base, domain);
if (ret)
goto fail;
}
return 0;
fail:
if (i)
mfd_remove_devices(parent);
return ret;
}
EXPORT_SYMBOL(mfd_add_devices);
static int mfd_remove_devices_fn(struct device *dev, void *data)
{
struct platform_device *pdev;
const struct mfd_cell *cell;
struct mfd_of_node_entry *of_entry, *tmp;
int *level = data;
if (dev->type != &mfd_dev_type)
return 0;
pdev = to_platform_device(dev);
cell = mfd_get_cell(pdev);
if (level && cell->level > *level)
return 0;
if (cell->swnode)
device_remove_software_node(&pdev->dev);
list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
if (of_entry->dev == &pdev->dev) {
list_del(&of_entry->list);
kfree(of_entry);
}
regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
cell->num_parent_supplies);
platform_device_unregister(pdev);
return 0;
}
void mfd_remove_devices_late(struct device *parent)
{
int level = MFD_DEP_LEVEL_HIGH;
device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
}
EXPORT_SYMBOL(mfd_remove_devices_late);
void mfd_remove_devices(struct device *parent)
{
int level = MFD_DEP_LEVEL_NORMAL;
device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
}
EXPORT_SYMBOL(mfd_remove_devices);
static void devm_mfd_dev_release(struct device *dev, void *res)
{
mfd_remove_devices(dev);
}
/**
* devm_mfd_add_devices - Resource managed version of mfd_add_devices()
*
* Returns 0 on success or an appropriate negative error number on failure.
* All child-devices of the MFD will automatically be removed when it gets
* unbinded.
*
* @dev: Pointer to parent device.
* @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
* of device numbering, or will be added to a device's cell_id.
* @cells: Array of (struct mfd_cell)s describing child devices.
* @n_devs: Number of child devices to register.
* @mem_base: Parent register range resource for child devices.
* @irq_base: Base of the range of virtual interrupt numbers allocated for
* this MFD device. Unused if @domain is specified.
* @domain: Interrupt domain to create mappings for hardware interrupts.
*/
int devm_mfd_add_devices(struct device *dev, int id,
const struct mfd_cell *cells, int n_devs,
struct resource *mem_base,
int irq_base, struct irq_domain *domain)
{
struct device **ptr;
int ret;
ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return -ENOMEM;
ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
irq_base, domain);
if (ret < 0) {
devres_free(ptr);
return ret;
}
*ptr = dev;
devres_add(dev, ptr);
return ret;
}
EXPORT_SYMBOL(devm_mfd_add_devices);
MODULE_DESCRIPTION("Core MFD support");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
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