xref: /openbmc/linux/drivers/mfd/mfd-core.c (revision 545e4006)
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/mfd/core.h>
17 
18 static int mfd_add_device(struct platform_device *parent,
19 		const struct mfd_cell *cell,
20 		struct resource *mem_base,
21 		int irq_base)
22 {
23 	struct resource res[cell->num_resources];
24 	struct platform_device *pdev;
25 	int ret = -ENOMEM;
26 	int r;
27 
28 	pdev = platform_device_alloc(cell->name, parent->id);
29 	if (!pdev)
30 		goto fail_alloc;
31 
32 	pdev->dev.parent = &parent->dev;
33 
34 	ret = platform_device_add_data(pdev,
35 			cell, sizeof(struct mfd_cell));
36 	if (ret)
37 		goto fail_device;
38 
39 	memset(res, 0, sizeof(res));
40 	for (r = 0; r < cell->num_resources; r++) {
41 		res[r].name = cell->resources[r].name;
42 		res[r].flags = cell->resources[r].flags;
43 
44 		/* Find out base to use */
45 		if (cell->resources[r].flags & IORESOURCE_MEM) {
46 			res[r].parent = mem_base;
47 			res[r].start = mem_base->start +
48 				cell->resources[r].start;
49 			res[r].end = mem_base->start +
50 				cell->resources[r].end;
51 		} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
52 			res[r].start = irq_base +
53 				cell->resources[r].start;
54 			res[r].end   = irq_base +
55 				cell->resources[r].end;
56 		} else {
57 			res[r].parent = cell->resources[r].parent;
58 			res[r].start = cell->resources[r].start;
59 			res[r].end   = cell->resources[r].end;
60 		}
61 	}
62 
63 	platform_device_add_resources(pdev, res, cell->num_resources);
64 
65 	ret = platform_device_add(pdev);
66 	if (ret)
67 		goto fail_device;
68 
69 	return 0;
70 
71 /*	platform_device_del(pdev); */
72 fail_device:
73 	platform_device_put(pdev);
74 fail_alloc:
75 	return ret;
76 }
77 
78 int mfd_add_devices(
79 		struct platform_device *parent,
80 		const struct mfd_cell *cells, int n_devs,
81 		struct resource *mem_base,
82 		int irq_base)
83 {
84 	int i;
85 	int ret = 0;
86 
87 	for (i = 0; i < n_devs; i++) {
88 		ret = mfd_add_device(parent, cells + i, mem_base, irq_base);
89 		if (ret)
90 			break;
91 	}
92 
93 	if (ret)
94 		mfd_remove_devices(parent);
95 
96 	return ret;
97 }
98 EXPORT_SYMBOL(mfd_add_devices);
99 
100 static int mfd_remove_devices_fn(struct device *dev, void *unused)
101 {
102 	platform_device_unregister(
103 			container_of(dev, struct platform_device, dev));
104 	return 0;
105 }
106 
107 void mfd_remove_devices(struct platform_device *parent)
108 {
109 	device_for_each_child(&parent->dev, NULL, mfd_remove_devices_fn);
110 }
111 EXPORT_SYMBOL(mfd_remove_devices);
112 
113 MODULE_LICENSE("GPL");
114 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
115