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/acpi.h>
  17#include <linux/mfd/core.h>
  18#include <linux/pm_runtime.h>
  19#include <linux/slab.h>
  20
  21static int mfd_add_device(struct device *parent, int id,
  22                          const struct mfd_cell *cell,
  23                          struct resource *mem_base,
  24                          int irq_base)
  25{
  26        struct resource *res;
  27        struct platform_device *pdev;
  28        int ret = -ENOMEM;
  29        int r;
  30
  31        pdev = platform_device_alloc(cell->name, id + cell->id);
  32        if (!pdev)
  33                goto fail_alloc;
  34
  35        res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
  36        if (!res)
  37                goto fail_device;
  38
  39        pdev->dev.parent = parent;
  40        platform_set_drvdata(pdev, cell->driver_data);
  41
  42        if (cell->data_size) {
  43                ret = platform_device_add_data(pdev,
  44                                        cell->platform_data, cell->data_size);
  45                if (ret)
  46                        goto fail_res;
  47        }
  48
  49        for (r = 0; r < cell->num_resources; r++) {
  50                res[r].name = cell->resources[r].name;
  51                res[r].flags = cell->resources[r].flags;
  52
  53                /* Find out base to use */
  54                if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
  55                        res[r].parent = mem_base;
  56                        res[r].start = mem_base->start +
  57                                cell->resources[r].start;
  58                        res[r].end = mem_base->start +
  59                                cell->resources[r].end;
  60                } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
  61                        res[r].start = irq_base +
  62                                cell->resources[r].start;
  63                        res[r].end   = irq_base +
  64                                cell->resources[r].end;
  65                } else {
  66                        res[r].parent = cell->resources[r].parent;
  67                        res[r].start = cell->resources[r].start;
  68                        res[r].end   = cell->resources[r].end;
  69                }
  70
  71                if (!cell->ignore_resource_conflicts) {
  72                        ret = acpi_check_resource_conflict(res);
  73                        if (ret)
  74                                goto fail_res;
  75                }
  76        }
  77
  78        ret = platform_device_add_resources(pdev, res, cell->num_resources);
  79        if (ret)
  80                goto fail_res;
  81
  82        ret = platform_device_add(pdev);
  83        if (ret)
  84                goto fail_res;
  85
  86        if (cell->pm_runtime_no_callbacks)
  87                pm_runtime_no_callbacks(&pdev->dev);
  88
  89        kfree(res);
  90
  91        return 0;
  92
  93/*      platform_device_del(pdev); */
  94fail_res:
  95        kfree(res);
  96fail_device:
  97        platform_device_put(pdev);
  98fail_alloc:
  99        return ret;
 100}
 101
 102int mfd_add_devices(struct device *parent, int id,
 103                    const struct mfd_cell *cells, int n_devs,
 104                    struct resource *mem_base,
 105                    int irq_base)
 106{
 107        int i;
 108        int ret = 0;
 109
 110        for (i = 0; i < n_devs; i++) {
 111                ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
 112                if (ret)
 113                        break;
 114        }
 115
 116        if (ret)
 117                mfd_remove_devices(parent);
 118
 119        return ret;
 120}
 121EXPORT_SYMBOL(mfd_add_devices);
 122
 123static int mfd_remove_devices_fn(struct device *dev, void *unused)
 124{
 125        platform_device_unregister(to_platform_device(dev));
 126        return 0;
 127}
 128
 129void mfd_remove_devices(struct device *parent)
 130{
 131        device_for_each_child(parent, NULL, mfd_remove_devices_fn);
 132}
 133EXPORT_SYMBOL(mfd_remove_devices);
 134
 135MODULE_LICENSE("GPL");
 136MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
 137