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/mfd/core.h>
  17
  18 static int mfd_add_device(struct platform_device *parent,
  19                 const struct mfd_cell *cell,
  20                 struct resource *mem_base,
  21                 int irq_base)
  22 {
  23         struct resource res[cell->num_resources];
  24         struct platform_device *pdev;
  25         int ret = -ENOMEM;
  26         int r;
  27
  28         pdev = platform_device_alloc(cell->name, parent->id);
  29         if (!pdev)
  30                 goto fail_alloc;
  31
  32         pdev->dev.parent = &parent->dev;
  33
  34         ret = platform_device_add_data(pdev,
  35                         cell, sizeof(struct mfd_cell));
  36         if (ret)
  37                 goto fail_device;
  38
  39         memset(res, 0, sizeof(res));
  40         for (r = 0; r < cell->num_resources; r++) {
  41                 res[r].name = cell->resources[r].name;
  42                 res[r].flags = cell->resources[r].flags;
  43
  44                 /* Find out base to use */
  45                 if (cell->resources[r].flags & IORESOURCE_MEM) {
  46                         res[r].parent = mem_base;
  47                         res[r].start = mem_base->start +
  48                                 cell->resources[r].start;
  49                         res[r].end = mem_base->start +
  50                                 cell->resources[r].end;
  51                 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
  52                         res[r].start = irq_base +
  53                                 cell->resources[r].start;
  54                         res[r].end   = irq_base +
  55                                 cell->resources[r].end;
  56                 } else {
  57                         res[r].parent = cell->resources[r].parent;
  58                         res[r].start = cell->resources[r].start;
  59                         res[r].end   = cell->resources[r].end;
  60                 }
  61         }
  62
  63         platform_device_add_resources(pdev, res, cell->num_resources);
  64
  65         ret = platform_device_add(pdev);
  66         if (ret)
  67                 goto fail_device;
  68
  69         return 0;
  70
  71 /*      platform_device_del(pdev); */
  72 fail_device:
  73         platform_device_put(pdev);
  74 fail_alloc:
  75         return ret;
  76 }
  77
  78 int mfd_add_devices(
  79                 struct platform_device *parent,
  80                 const struct mfd_cell *cells, int n_devs,
  81                 struct resource *mem_base,
  82                 int irq_base)
  83 {
  84         int i;
  85         int ret = 0;
  86
  87         for (i = 0; i < n_devs; i++) {
  88                 ret = mfd_add_device(parent, cells + i, mem_base, irq_base);
  89                 if (ret)
  90                         break;
  91         }
  92
  93         if (ret)
  94                 mfd_remove_devices(parent);
  95
  96         return ret;
  97 }
  98 EXPORT_SYMBOL(mfd_add_devices);
  99
 100 static int mfd_remove_devices_fn(struct device *dev, void *unused)
 101 {
 102         platform_device_unregister(
 103                         container_of(dev, struct platform_device, dev));
 104         return 0;
 105 }
 106
 107 void mfd_remove_devices(struct platform_device *parent)
 108 {
 109         device_for_each_child(&parent->dev, NULL, mfd_remove_devices_fn);
 110 }
 111 EXPORT_SYMBOL(mfd_remove_devices);
 112
 113 MODULE_LICENSE("GPL");
 114 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");