xref: /linux/drivers/mfd/mfd-core.c (revision d39d0ed196aa1685bb24771e92f78633c66ac9cb)
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");
129