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