Linux 2.6.34-rc3
[pohmelfs.git] / drivers / mfd / mfd-core.c
blobaa17f4bddc56a1a77fee6f1a641e064f3aed1059
1 /*
2 * drivers/mfd/mfd-core.c
4 * core MFD support
5 * Copyright (c) 2006 Ian Molton
6 * Copyright (c) 2007,2008 Dmitry Baryshkov
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.
14 #include <linux/kernel.h>
15 #include <linux/platform_device.h>
16 #include <linux/acpi.h>
17 #include <linux/mfd/core.h>
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)
24 struct resource *res;
25 struct platform_device *pdev;
26 int ret = -ENOMEM;
27 int r;
29 pdev = platform_device_alloc(cell->name, id + cell->id);
30 if (!pdev)
31 goto fail_alloc;
33 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
34 if (!res)
35 goto fail_device;
37 pdev->dev.parent = parent;
38 platform_set_drvdata(pdev, cell->driver_data);
40 ret = platform_device_add_data(pdev,
41 cell->platform_data, cell->data_size);
42 if (ret)
43 goto fail_res;
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;
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;
67 ret = acpi_check_resource_conflict(res);
68 if (ret)
69 goto fail_res;
72 platform_device_add_resources(pdev, res, cell->num_resources);
74 ret = platform_device_add(pdev);
75 if (ret)
76 goto fail_res;
78 kfree(res);
80 return 0;
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;
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)
96 int i;
97 int ret = 0;
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;
105 if (ret)
106 mfd_remove_devices(parent);
108 return ret;
110 EXPORT_SYMBOL(mfd_add_devices);
112 static int mfd_remove_devices_fn(struct device *dev, void *unused)
114 platform_device_unregister(to_platform_device(dev));
115 return 0;
118 void mfd_remove_devices(struct device *parent)
120 device_for_each_child(parent, NULL, mfd_remove_devices_fn);
122 EXPORT_SYMBOL(mfd_remove_devices);
124 MODULE_LICENSE("GPL");
125 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");