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