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