LCOV - code coverage report
Current view: top level - drivers/acpi - acpi_platform.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 39 59 66.1 %
Date: 2022-03-28 13:20:08 Functions: 2 3 66.7 %
Branches: 11 30 36.7 %

           Branch data     Line data    Source code
       1                 :            : // SPDX-License-Identifier: GPL-2.0-only
       2                 :            : /*
       3                 :            :  * ACPI support for platform bus type.
       4                 :            :  *
       5                 :            :  * Copyright (C) 2012, Intel Corporation
       6                 :            :  * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
       7                 :            :  *          Mathias Nyman <mathias.nyman@linux.intel.com>
       8                 :            :  *          Rafael J. Wysocki <rafael.j.wysocki@intel.com>
       9                 :            :  */
      10                 :            : 
      11                 :            : #include <linux/acpi.h>
      12                 :            : #include <linux/device.h>
      13                 :            : #include <linux/err.h>
      14                 :            : #include <linux/kernel.h>
      15                 :            : #include <linux/module.h>
      16                 :            : #include <linux/dma-mapping.h>
      17                 :            : #include <linux/pci.h>
      18                 :            : #include <linux/platform_device.h>
      19                 :            : 
      20                 :            : #include "internal.h"
      21                 :            : 
      22                 :            : ACPI_MODULE_NAME("platform");
      23                 :            : 
      24                 :            : static const struct acpi_device_id forbidden_id_list[] = {
      25                 :            :         {"PNP0000",  0},      /* PIC */
      26                 :            :         {"PNP0100",  0},      /* Timer */
      27                 :            :         {"PNP0200",  0},      /* AT DMA Controller */
      28                 :            :         {"ACPI0009", 0},      /* IOxAPIC */
      29                 :            :         {"ACPI000A", 0},      /* IOAPIC */
      30                 :            :         {"SMB0001",  0},      /* ACPI SMBUS virtual device */
      31                 :            :         {"", 0},
      32                 :            : };
      33                 :            : 
      34                 :          0 : static struct platform_device *acpi_platform_device_find_by_companion(struct acpi_device *adev)
      35                 :            : {
      36                 :          0 :         struct device *dev;
      37                 :            : 
      38                 :          0 :         dev = bus_find_device_by_acpi_dev(&platform_bus_type, adev);
      39         [ #  # ]:          0 :         return dev ? to_platform_device(dev) : NULL;
      40                 :            : }
      41                 :            : 
      42                 :          0 : static int acpi_platform_device_remove_notify(struct notifier_block *nb,
      43                 :            :                                               unsigned long value, void *arg)
      44                 :            : {
      45                 :          0 :         struct acpi_device *adev = arg;
      46                 :          0 :         struct platform_device *pdev;
      47                 :            : 
      48         [ #  # ]:          0 :         switch (value) {
      49                 :            :         case ACPI_RECONFIG_DEVICE_ADD:
      50                 :            :                 /* Nothing to do here */
      51                 :            :                 break;
      52                 :            :         case ACPI_RECONFIG_DEVICE_REMOVE:
      53   [ #  #  #  # ]:          0 :                 if (!acpi_device_enumerated(adev))
      54                 :            :                         break;
      55                 :            : 
      56                 :          0 :                 pdev = acpi_platform_device_find_by_companion(adev);
      57         [ #  # ]:          0 :                 if (!pdev)
      58                 :            :                         break;
      59                 :            : 
      60                 :          0 :                 platform_device_unregister(pdev);
      61                 :          0 :                 put_device(&pdev->dev);
      62                 :          0 :                 break;
      63                 :            :         }
      64                 :            : 
      65                 :          0 :         return NOTIFY_OK;
      66                 :            : }
      67                 :            : 
      68                 :            : static struct notifier_block acpi_platform_notifier = {
      69                 :            :         .notifier_call = acpi_platform_device_remove_notify,
      70                 :            : };
      71                 :            : 
      72                 :            : static void acpi_platform_fill_resource(struct acpi_device *adev,
      73                 :            :         const struct resource *src, struct resource *dest)
      74                 :            : {
      75                 :            :         struct device *parent;
      76                 :            : 
      77                 :            :         *dest = *src;
      78                 :            : 
      79                 :            :         /*
      80                 :            :          * If the device has parent we need to take its resources into
      81                 :            :          * account as well because this device might consume part of those.
      82                 :            :          */
      83                 :            :         parent = acpi_get_first_physical_node(adev->parent);
      84                 :            :         if (parent && dev_is_pci(parent))
      85                 :            :                 dest->parent = pci_find_resource(to_pci_dev(parent), dest);
      86                 :            : }
      87                 :            : 
      88                 :            : /**
      89                 :            :  * acpi_create_platform_device - Create platform device for ACPI device node
      90                 :            :  * @adev: ACPI device node to create a platform device for.
      91                 :            :  * @properties: Optional collection of build-in properties.
      92                 :            :  *
      93                 :            :  * Check if the given @adev can be represented as a platform device and, if
      94                 :            :  * that's the case, create and register a platform device, populate its common
      95                 :            :  * resources and returns a pointer to it.  Otherwise, return %NULL.
      96                 :            :  *
      97                 :            :  * Name of the platform device will be the same as @adev's.
      98                 :            :  */
      99                 :         60 : struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
     100                 :            :                                         struct property_entry *properties)
     101                 :            : {
     102                 :         60 :         struct platform_device *pdev = NULL;
     103                 :         60 :         struct platform_device_info pdevinfo;
     104                 :         60 :         struct resource_entry *rentry;
     105                 :         60 :         struct list_head resource_list;
     106                 :         60 :         struct resource *resources = NULL;
     107                 :         60 :         int count;
     108                 :            : 
     109                 :            :         /* If the ACPI node already has a physical device attached, skip it. */
     110         [ +  - ]:         60 :         if (adev->physical_node_count)
     111                 :            :                 return NULL;
     112                 :            : 
     113         [ +  - ]:         60 :         if (!acpi_match_device_ids(adev, forbidden_id_list))
     114                 :            :                 return ERR_PTR(-EINVAL);
     115                 :            : 
     116                 :         60 :         INIT_LIST_HEAD(&resource_list);
     117                 :         60 :         count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
     118         [ +  - ]:         60 :         if (count < 0) {
     119                 :            :                 return NULL;
     120         [ +  - ]:         60 :         } else if (count > 0) {
     121                 :         60 :                 resources = kcalloc(count, sizeof(struct resource),
     122                 :            :                                     GFP_KERNEL);
     123         [ -  + ]:         60 :                 if (!resources) {
     124                 :          0 :                         dev_err(&adev->dev, "No memory for resources\n");
     125                 :          0 :                         acpi_dev_free_resource_list(&resource_list);
     126                 :          0 :                         return ERR_PTR(-ENOMEM);
     127                 :            :                 }
     128                 :         60 :                 count = 0;
     129         [ +  + ]:        120 :                 list_for_each_entry(rentry, &resource_list, node)
     130                 :         60 :                         acpi_platform_fill_resource(adev, rentry->res,
     131                 :         60 :                                                     &resources[count++]);
     132                 :            : 
     133                 :         60 :                 acpi_dev_free_resource_list(&resource_list);
     134                 :            :         }
     135                 :            : 
     136                 :         60 :         memset(&pdevinfo, 0, sizeof(pdevinfo));
     137                 :            :         /*
     138                 :            :          * If the ACPI node has a parent and that parent has a physical device
     139                 :            :          * attached to it, that physical device should be the parent of the
     140                 :            :          * platform device we are about to create.
     141                 :            :          */
     142                 :        120 :         pdevinfo.parent = adev->parent ?
     143         [ +  - ]:         60 :                 acpi_get_first_physical_node(adev->parent) : NULL;
     144         [ +  - ]:         60 :         pdevinfo.name = dev_name(&adev->dev);
     145                 :         60 :         pdevinfo.id = -1;
     146                 :         60 :         pdevinfo.res = resources;
     147                 :         60 :         pdevinfo.num_res = count;
     148                 :         60 :         pdevinfo.fwnode = acpi_fwnode_handle(adev);
     149                 :         60 :         pdevinfo.properties = properties;
     150                 :            : 
     151         [ +  - ]:         60 :         if (acpi_dma_supported(adev))
     152                 :         60 :                 pdevinfo.dma_mask = DMA_BIT_MASK(32);
     153                 :            :         else
     154                 :          0 :                 pdevinfo.dma_mask = 0;
     155                 :            : 
     156                 :         60 :         pdev = platform_device_register_full(&pdevinfo);
     157         [ -  + ]:         60 :         if (IS_ERR(pdev))
     158                 :          0 :                 dev_err(&adev->dev, "platform device creation failed: %ld\n",
     159                 :            :                         PTR_ERR(pdev));
     160                 :            :         else {
     161                 :         60 :                 set_dev_node(&pdev->dev, acpi_get_node(adev->handle));
     162                 :            :                 dev_dbg(&adev->dev, "created platform device %s\n",
     163                 :            :                         dev_name(&pdev->dev));
     164                 :            :         }
     165                 :            : 
     166                 :         60 :         kfree(resources);
     167                 :            : 
     168                 :         60 :         return pdev;
     169                 :            : }
     170                 :            : EXPORT_SYMBOL_GPL(acpi_create_platform_device);
     171                 :            : 
     172                 :         30 : void __init acpi_platform_init(void)
     173                 :            : {
     174                 :         30 :         acpi_reconfig_notifier_register(&acpi_platform_notifier);
     175                 :         30 : }

Generated by: LCOV version 1.14