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 device *parent, int id,
  19                           const struct mfd_cell *cell,
  20                           struct resource *mem_base,
  21                           int irq_base)
  22 {
  23         struct resource *res;
  24         struct platform_device *pdev;
  25         int ret = -ENOMEM;
  26         int r;
  27
  28         pdev = platform_device_alloc(cell->name, id);
  29         if (!pdev)
  30                 goto fail_alloc;
  31
  32         res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
  33         if (!res)
  34                 goto fail_device;
  35
  36         pdev->dev.parent = parent;
  37
  38         ret = platform_device_add_data(pdev,
  39                         cell->platform_data, cell->data_size);
  40         if (ret)
  41                 goto fail_res;
  42
  43         for (r = 0; r < cell->num_resources; r++) {
  44                 res[r].name = cell->resources[r].name;
  45                 res[r].flags = cell->resources[r].flags;
  46
  47                 /* Find out base to use */
  48                 if (cell->resources[r].flags & IORESOURCE_MEM) {
  49                         res[r].parent = mem_base;
  50                         res[r].start = mem_base->start +
  51                                 cell->resources[r].start;
  52                         res[r].end = mem_base->start +
  53                                 cell->resources[r].end;
  54                 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
  55                         res[r].start = irq_base +
  56                                 cell->resources[r].start;
  57                         res[r].end   = irq_base +
  58                                 cell->resources[r].end;
  59                 } else {
  60                         res[r].parent = cell->resources[r].parent;
  61                         res[r].start = cell->resources[r].start;
  62                         res[r].end   = cell->resources[r].end;
  63                 }
  64         }
  65
  66         platform_device_add_resources(pdev, res, cell->num_resources);
  67
  68         ret = platform_device_add(pdev);
  69         if (ret)
  70                 goto fail_res;
  71
  72         kfree(res);
  73
  74         return 0;
  75
  76 /*      platform_device_del(pdev); */
  77 fail_res:
  78         kfree(res);
  79 fail_device:
  80         platform_device_put(pdev);
  81 fail_alloc:
  82         return ret;
  83 }
  84
  85 int mfd_add_devices(struct device *parent, int id,
  86                     const struct mfd_cell *cells, int n_devs,
  87                     struct resource *mem_base,
  88                     int irq_base)
  89 {
  90         int i;
  91         int ret = 0;
  92
  93         for (i = 0; i < n_devs; i++) {
  94                 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
  95                 if (ret)
  96                         break;
  97         }
  98
  99         if (ret)
 100                 mfd_remove_devices(parent);
 101
 102         return ret;
 103 }
 104 EXPORT_SYMBOL(mfd_add_devices);
 105
 106 static int mfd_remove_devices_fn(struct device *dev, void *unused)
 107 {
 108         platform_device_unregister(to_platform_device(dev));
 109         return 0;
 110 }
 111
 112 void mfd_remove_devices(struct device *parent)
 113 {
 114         device_for_each_child(parent, NULL, mfd_remove_devices_fn);
 115 }
 116 EXPORT_SYMBOL(mfd_remove_devices);
 117
 118 MODULE_LICENSE("GPL");
 119 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");