drivers/mfd/mfd-core.c

   1 /*
   2  * drivers/mfd/mfd-core.c
   3  *
   4  * core MFD support
   5  * Copyright (c) 2006 Ian Molton
   6  * Copyright (c) 2007,2008 Dmitry Baryshkov
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/acpi.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/slab.h>
  20
  21 static int mfd_add_device(struct device *parent, int id,
  22                           const struct mfd_cell *cell,
  23                           struct resource *mem_base,
  24                           int irq_base)
  25 {
  26         struct resource *res;
  27         struct platform_device *pdev;
  28         int ret = -ENOMEM;
  29         int r;
  30
  31         pdev = platform_device_alloc(cell->name, id + cell->id);
  32         if (!pdev)
  33                 goto fail_alloc;
  34
  35         res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
  36         if (!res)
  37                 goto fail_device;
  38
  39         pdev->dev.parent = parent;
  40
  41         ret = platform_device_add_data(pdev, cell, sizeof(*cell));
  42         if (ret)
  43                 goto fail_res;
  44
  45         for (r = 0; r < cell->num_resources; r++) {
  46                 res[r].name = cell->resources[r].name;
  47                 res[r].flags = cell->resources[r].flags;
  48
  49                 /* Find out base to use */
  50                 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
  51                         res[r].parent = mem_base;
  52                         res[r].start = mem_base->start +
  53                                 cell->resources[r].start;
  54                         res[r].end = mem_base->start +
  55                                 cell->resources[r].end;
  56                 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
  57                         res[r].start = irq_base +
  58                                 cell->resources[r].start;
  59                         res[r].end   = irq_base +
  60                                 cell->resources[r].end;
  61                 } else {
  62                         res[r].parent = cell->resources[r].parent;
  63                         res[r].start = cell->resources[r].start;
  64                         res[r].end   = cell->resources[r].end;
  65                 }
  66
  67                 if (!cell->ignore_resource_conflicts) {
  68                         ret = acpi_check_resource_conflict(res);
  69                         if (ret)
  70                                 goto fail_res;
  71                 }
  72         }
  73
  74         ret = platform_device_add_resources(pdev, res, cell->num_resources);
  75         if (ret)
  76                 goto fail_res;
  77
  78         ret = platform_device_add(pdev);
  79         if (ret)
  80                 goto fail_res;
  81
  82         if (cell->pm_runtime_no_callbacks)
  83                 pm_runtime_no_callbacks(&pdev->dev);
  84
  85         kfree(res);
  86
  87         return 0;
  88
  89 /*      platform_device_del(pdev); */
  90 fail_res:
  91         kfree(res);
  92 fail_device:
  93         platform_device_put(pdev);
  94 fail_alloc:
  95         return ret;
  96 }
  97
  98 int mfd_add_devices(struct device *parent, int id,
  99                     const struct mfd_cell *cells, int n_devs,
 100                     struct resource *mem_base,
 101                     int irq_base)
 102 {
 103         int i;
 104         int ret = 0;
 105
 106         for (i = 0; i < n_devs; i++) {
 107                 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
 108                 if (ret)
 109                         break;
 110         }
 111
 112         if (ret)
 113                 mfd_remove_devices(parent);
 114
 115         return ret;
 116 }
 117 EXPORT_SYMBOL(mfd_add_devices);
 118
 119 static int mfd_remove_devices_fn(struct device *dev, void *unused)
 120 {
 121         platform_device_unregister(to_platform_device(dev));
 122         return 0;
 123 }
 124
 125 void mfd_remove_devices(struct device *parent)
 126 {
 127         device_for_each_child(parent, NULL, mfd_remove_devices_fn);
 128 }
 129 EXPORT_SYMBOL(mfd_remove_devices);
 130
 131 MODULE_LICENSE("GPL");
 132 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");