1823a57b7d8f06f083f921bd7e9cfaa4f40c98a8
[sfrench/cifs-2.6.git] / 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) && mem_base) {
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         ret = platform_device_add_resources(pdev, res, cell->num_resources);
74         if (ret)
75                 goto fail_res;
76
77         ret = platform_device_add(pdev);
78         if (ret)
79                 goto fail_res;
80
81         kfree(res);
82
83         return 0;
84
85 /*      platform_device_del(pdev); */
86 fail_res:
87         kfree(res);
88 fail_device:
89         platform_device_put(pdev);
90 fail_alloc:
91         return ret;
92 }
93
94 int mfd_add_devices(struct device *parent, int id,
95                     const struct mfd_cell *cells, int n_devs,
96                     struct resource *mem_base,
97                     int irq_base)
98 {
99         int i;
100         int ret = 0;
101
102         for (i = 0; i < n_devs; i++) {
103                 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
104                 if (ret)
105                         break;
106         }
107
108         if (ret)
109                 mfd_remove_devices(parent);
110
111         return ret;
112 }
113 EXPORT_SYMBOL(mfd_add_devices);
114
115 static int mfd_remove_devices_fn(struct device *dev, void *unused)
116 {
117         platform_device_unregister(to_platform_device(dev));
118         return 0;
119 }
120
121 void mfd_remove_devices(struct device *parent)
122 {
123         device_for_each_child(parent, NULL, mfd_remove_devices_fn);
124 }
125 EXPORT_SYMBOL(mfd_remove_devices);
126
127 MODULE_LICENSE("GPL");
128 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");