linux/drivers/mfd/mfd-core.c
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   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
  18static 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); */
  77fail_res:
  78        kfree(res);
  79fail_device:
  80        platform_device_put(pdev);
  81fail_alloc:
  82        return ret;
  83}
  84
  85int 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}
 104EXPORT_SYMBOL(mfd_add_devices);
 105
 106static int mfd_remove_devices_fn(struct device *dev, void *unused)
 107{
 108        platform_device_unregister(to_platform_device(dev));
 109        return 0;
 110}
 111
 112void mfd_remove_devices(struct device *parent)
 113{
 114        device_for_each_child(parent, NULL, mfd_remove_devices_fn);
 115}
 116EXPORT_SYMBOL(mfd_remove_devices);
 117
 118MODULE_LICENSE("GPL");
 119MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
 120