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![Wolfram Sang](/assets/img/avatar_default.png)
Follow the advice of the below link and prefer 'strscpy' in this subsystem. Conversion is 1:1 because the return value is not used. Generated by a coccinelle script. Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/ Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20220818210030.7012-1-wsa+renesas@sang-engineering.com
464 lines
11 KiB
C
464 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* drivers/mfd/mfd-core.c
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*
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* core MFD support
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* Copyright (c) 2006 Ian Molton
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* Copyright (c) 2007,2008 Dmitry Baryshkov
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include <linux/list.h>
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#include <linux/property.h>
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#include <linux/mfd/core.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/regulator/consumer.h>
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static LIST_HEAD(mfd_of_node_list);
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struct mfd_of_node_entry {
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struct list_head list;
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struct device *dev;
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struct device_node *np;
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};
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static struct device_type mfd_dev_type = {
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.name = "mfd_device",
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};
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int mfd_cell_enable(struct platform_device *pdev)
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{
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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if (!cell->enable) {
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dev_dbg(&pdev->dev, "No .enable() call-back registered\n");
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return 0;
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}
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return cell->enable(pdev);
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}
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EXPORT_SYMBOL(mfd_cell_enable);
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int mfd_cell_disable(struct platform_device *pdev)
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{
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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if (!cell->disable) {
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dev_dbg(&pdev->dev, "No .disable() call-back registered\n");
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return 0;
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}
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return cell->disable(pdev);
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}
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EXPORT_SYMBOL(mfd_cell_disable);
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#if IS_ENABLED(CONFIG_ACPI)
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struct match_ids_walk_data {
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struct acpi_device_id *ids;
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struct acpi_device *adev;
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};
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static int match_device_ids(struct acpi_device *adev, void *data)
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{
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struct match_ids_walk_data *wd = data;
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if (!acpi_match_device_ids(adev, wd->ids)) {
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wd->adev = adev;
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return 1;
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}
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return 0;
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}
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static void mfd_acpi_add_device(const struct mfd_cell *cell,
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struct platform_device *pdev)
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{
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const struct mfd_cell_acpi_match *match = cell->acpi_match;
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struct acpi_device *adev = NULL;
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struct acpi_device *parent;
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parent = ACPI_COMPANION(pdev->dev.parent);
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if (!parent)
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return;
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/*
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* MFD child device gets its ACPI handle either from the ACPI device
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* directly under the parent that matches the either _HID or _CID, or
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* _ADR or it will use the parent handle if is no ID is given.
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*
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* Note that use of _ADR is a grey area in the ACPI specification,
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* though at least Intel Galileo Gen 2 is using it to distinguish
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* the children devices.
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*/
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if (match) {
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if (match->pnpid) {
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struct acpi_device_id ids[2] = {};
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struct match_ids_walk_data wd = {
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.adev = NULL,
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.ids = ids,
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};
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strscpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
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acpi_dev_for_each_child(parent, match_device_ids, &wd);
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adev = wd.adev;
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} else {
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adev = acpi_find_child_device(parent, match->adr, false);
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}
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}
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ACPI_COMPANION_SET(&pdev->dev, adev ?: parent);
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}
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#else
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static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
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struct platform_device *pdev)
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{
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}
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#endif
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static int mfd_match_of_node_to_dev(struct platform_device *pdev,
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struct device_node *np,
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const struct mfd_cell *cell)
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{
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#if IS_ENABLED(CONFIG_OF)
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struct mfd_of_node_entry *of_entry;
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const __be32 *reg;
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u64 of_node_addr;
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/* Skip if OF node has previously been allocated to a device */
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list_for_each_entry(of_entry, &mfd_of_node_list, list)
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if (of_entry->np == np)
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return -EAGAIN;
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if (!cell->use_of_reg)
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/* No of_reg defined - allocate first free compatible match */
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goto allocate_of_node;
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/* We only care about each node's first defined address */
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reg = of_get_address(np, 0, NULL, NULL);
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if (!reg)
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/* OF node does not contatin a 'reg' property to match to */
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return -EAGAIN;
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of_node_addr = of_read_number(reg, of_n_addr_cells(np));
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if (cell->of_reg != of_node_addr)
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/* No match */
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return -EAGAIN;
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allocate_of_node:
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of_entry = kzalloc(sizeof(*of_entry), GFP_KERNEL);
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if (!of_entry)
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return -ENOMEM;
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of_entry->dev = &pdev->dev;
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of_entry->np = np;
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list_add_tail(&of_entry->list, &mfd_of_node_list);
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pdev->dev.of_node = np;
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pdev->dev.fwnode = &np->fwnode;
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#endif
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return 0;
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}
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static int mfd_add_device(struct device *parent, int id,
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const struct mfd_cell *cell,
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struct resource *mem_base,
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int irq_base, struct irq_domain *domain)
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{
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struct resource *res;
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struct platform_device *pdev;
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struct device_node *np = NULL;
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struct mfd_of_node_entry *of_entry, *tmp;
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int ret = -ENOMEM;
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int platform_id;
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int r;
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if (id == PLATFORM_DEVID_AUTO)
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platform_id = id;
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else
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platform_id = id + cell->id;
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pdev = platform_device_alloc(cell->name, platform_id);
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if (!pdev)
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goto fail_alloc;
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pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
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if (!pdev->mfd_cell)
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goto fail_device;
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res = kcalloc(cell->num_resources, sizeof(*res), GFP_KERNEL);
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if (!res)
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goto fail_device;
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pdev->dev.parent = parent;
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pdev->dev.type = &mfd_dev_type;
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pdev->dev.dma_mask = parent->dma_mask;
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pdev->dev.dma_parms = parent->dma_parms;
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pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
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ret = regulator_bulk_register_supply_alias(
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&pdev->dev, cell->parent_supplies,
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parent, cell->parent_supplies,
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cell->num_parent_supplies);
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if (ret < 0)
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goto fail_res;
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if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell->of_compatible) {
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for_each_child_of_node(parent->of_node, np) {
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if (of_device_is_compatible(np, cell->of_compatible)) {
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/* Ignore 'disabled' devices error free */
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if (!of_device_is_available(np)) {
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of_node_put(np);
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ret = 0;
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goto fail_alias;
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}
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ret = mfd_match_of_node_to_dev(pdev, np, cell);
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if (ret == -EAGAIN)
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continue;
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of_node_put(np);
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if (ret)
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goto fail_alias;
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break;
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}
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}
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if (!pdev->dev.of_node)
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pr_warn("%s: Failed to locate of_node [id: %d]\n",
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cell->name, platform_id);
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}
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mfd_acpi_add_device(cell, pdev);
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if (cell->pdata_size) {
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ret = platform_device_add_data(pdev,
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cell->platform_data, cell->pdata_size);
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if (ret)
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goto fail_of_entry;
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}
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if (cell->swnode) {
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ret = device_add_software_node(&pdev->dev, cell->swnode);
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if (ret)
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goto fail_of_entry;
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}
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for (r = 0; r < cell->num_resources; r++) {
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res[r].name = cell->resources[r].name;
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res[r].flags = cell->resources[r].flags;
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/* Find out base to use */
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if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
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res[r].parent = mem_base;
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res[r].start = mem_base->start +
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cell->resources[r].start;
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res[r].end = mem_base->start +
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cell->resources[r].end;
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} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
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if (domain) {
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/* Unable to create mappings for IRQ ranges. */
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WARN_ON(cell->resources[r].start !=
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cell->resources[r].end);
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res[r].start = res[r].end = irq_create_mapping(
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domain, cell->resources[r].start);
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} else {
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res[r].start = irq_base +
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cell->resources[r].start;
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res[r].end = irq_base +
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cell->resources[r].end;
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}
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} else {
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res[r].parent = cell->resources[r].parent;
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res[r].start = cell->resources[r].start;
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res[r].end = cell->resources[r].end;
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}
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if (!cell->ignore_resource_conflicts) {
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if (has_acpi_companion(&pdev->dev)) {
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ret = acpi_check_resource_conflict(&res[r]);
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if (ret)
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goto fail_res_conflict;
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}
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}
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}
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ret = platform_device_add_resources(pdev, res, cell->num_resources);
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if (ret)
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goto fail_res_conflict;
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ret = platform_device_add(pdev);
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if (ret)
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goto fail_res_conflict;
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if (cell->pm_runtime_no_callbacks)
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pm_runtime_no_callbacks(&pdev->dev);
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kfree(res);
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return 0;
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fail_res_conflict:
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if (cell->swnode)
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device_remove_software_node(&pdev->dev);
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fail_of_entry:
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list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
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if (of_entry->dev == &pdev->dev) {
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list_del(&of_entry->list);
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kfree(of_entry);
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}
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fail_alias:
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regulator_bulk_unregister_supply_alias(&pdev->dev,
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cell->parent_supplies,
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cell->num_parent_supplies);
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fail_res:
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kfree(res);
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fail_device:
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platform_device_put(pdev);
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fail_alloc:
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return ret;
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}
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/**
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* mfd_add_devices - register child devices
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*
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* @parent: Pointer to parent device.
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* @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
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* of device numbering, or will be added to a device's cell_id.
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* @cells: Array of (struct mfd_cell)s describing child devices.
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* @n_devs: Number of child devices to register.
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* @mem_base: Parent register range resource for child devices.
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* @irq_base: Base of the range of virtual interrupt numbers allocated for
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* this MFD device. Unused if @domain is specified.
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* @domain: Interrupt domain to create mappings for hardware interrupts.
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*/
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int mfd_add_devices(struct device *parent, int id,
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const struct mfd_cell *cells, int n_devs,
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struct resource *mem_base,
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int irq_base, struct irq_domain *domain)
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{
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int i;
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int ret;
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for (i = 0; i < n_devs; i++) {
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ret = mfd_add_device(parent, id, cells + i, mem_base,
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irq_base, domain);
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if (ret)
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goto fail;
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}
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return 0;
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fail:
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if (i)
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mfd_remove_devices(parent);
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return ret;
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}
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EXPORT_SYMBOL(mfd_add_devices);
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static int mfd_remove_devices_fn(struct device *dev, void *data)
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{
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struct platform_device *pdev;
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const struct mfd_cell *cell;
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struct mfd_of_node_entry *of_entry, *tmp;
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int *level = data;
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if (dev->type != &mfd_dev_type)
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return 0;
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pdev = to_platform_device(dev);
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cell = mfd_get_cell(pdev);
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if (level && cell->level > *level)
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return 0;
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if (cell->swnode)
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device_remove_software_node(&pdev->dev);
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list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
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if (of_entry->dev == &pdev->dev) {
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list_del(&of_entry->list);
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kfree(of_entry);
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}
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regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
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cell->num_parent_supplies);
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platform_device_unregister(pdev);
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return 0;
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}
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void mfd_remove_devices_late(struct device *parent)
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{
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int level = MFD_DEP_LEVEL_HIGH;
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device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
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}
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EXPORT_SYMBOL(mfd_remove_devices_late);
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void mfd_remove_devices(struct device *parent)
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{
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int level = MFD_DEP_LEVEL_NORMAL;
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device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
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}
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EXPORT_SYMBOL(mfd_remove_devices);
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static void devm_mfd_dev_release(struct device *dev, void *res)
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{
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mfd_remove_devices(dev);
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}
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/**
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* devm_mfd_add_devices - Resource managed version of mfd_add_devices()
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*
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* Returns 0 on success or an appropriate negative error number on failure.
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* All child-devices of the MFD will automatically be removed when it gets
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* unbinded.
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*
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* @dev: Pointer to parent device.
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* @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
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* of device numbering, or will be added to a device's cell_id.
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* @cells: Array of (struct mfd_cell)s describing child devices.
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* @n_devs: Number of child devices to register.
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* @mem_base: Parent register range resource for child devices.
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* @irq_base: Base of the range of virtual interrupt numbers allocated for
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* this MFD device. Unused if @domain is specified.
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* @domain: Interrupt domain to create mappings for hardware interrupts.
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*/
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int devm_mfd_add_devices(struct device *dev, int id,
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const struct mfd_cell *cells, int n_devs,
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struct resource *mem_base,
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int irq_base, struct irq_domain *domain)
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{
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struct device **ptr;
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int ret;
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ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return -ENOMEM;
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ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
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irq_base, domain);
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if (ret < 0) {
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devres_free(ptr);
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return ret;
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}
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*ptr = dev;
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devres_add(dev, ptr);
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return ret;
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}
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EXPORT_SYMBOL(devm_mfd_add_devices);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
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