LXR linux/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
  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        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); */
  78fail_res:
  79        kfree(res);
  80fail_device:
  81        platform_device_put(pdev);
  82fail_alloc:
  83        return ret;
  84}
  85
  86int 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}
 105EXPORT_SYMBOL(mfd_add_devices);
 106
 107static int mfd_remove_devices_fn(struct device *dev, void *unused)
 108{
 109        platform_device_unregister(to_platform_device(dev));
 110        return 0;
 111}
 112
 113void mfd_remove_devices(struct device *parent)
 114{
 115        device_for_each_child(parent, NULL, mfd_remove_devices_fn);
 116}
 117EXPORT_SYMBOL(mfd_remove_devices);
 118
 119MODULE_LICENSE("GPL");
 120MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
 121