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435 lines
11 KiB
435 lines
11 KiB
// 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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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 *parent, *child; |
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struct acpi_device *adev = NULL; |
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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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strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id)); |
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list_for_each_entry(child, &parent->children, node) { |
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if (!acpi_match_device_ids(child, ids)) { |
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adev = child; |
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break; |
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} |
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} |
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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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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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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_of_entry; |
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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_of_entry; |
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ret = platform_device_add(pdev); |
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if (ret) |
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goto fail_of_entry; |
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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_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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device_remove_software_node(&pdev->dev); |
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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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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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regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies, |
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cell->num_parent_supplies); |
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device_remove_software_node(&pdev->dev); |
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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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