Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
[pandora-kernel.git] / arch / microblaze / kernel / of_device.c
1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/of.h>
4 #include <linux/init.h>
5 #include <linux/module.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/slab.h>
8 #include <linux/of_device.h>
9
10 #include <linux/errno.h>
11
12 void of_device_make_bus_id(struct of_device *dev)
13 {
14         static atomic_t bus_no_reg_magic;
15         struct device_node *node = dev->node;
16         char *name = dev->dev.bus_id;
17         const u32 *reg;
18         u64 addr;
19         int magic;
20
21         /*
22          * For MMIO, get the physical address
23          */
24         reg = of_get_property(node, "reg", NULL);
25         if (reg) {
26                 addr = of_translate_address(node, reg);
27                 if (addr != OF_BAD_ADDR) {
28                         snprintf(name, BUS_ID_SIZE,
29                                  "%llx.%s", (unsigned long long)addr,
30                                  node->name);
31                         return;
32                 }
33         }
34
35         /*
36          * No BusID, use the node name and add a globally incremented
37          * counter (and pray...)
38          */
39         magic = atomic_add_return(1, &bus_no_reg_magic);
40         snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);
41 }
42 EXPORT_SYMBOL(of_device_make_bus_id);
43
44 struct of_device *of_device_alloc(struct device_node *np,
45                                   const char *bus_id,
46                                   struct device *parent)
47 {
48         struct of_device *dev;
49
50         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
51         if (!dev)
52                 return NULL;
53
54         dev->node = of_node_get(np);
55         dev->dev.dma_mask = &dev->dma_mask;
56         dev->dev.parent = parent;
57         dev->dev.release = of_release_dev;
58         dev->dev.archdata.of_node = np;
59
60         if (bus_id)
61                 strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
62         else
63                 of_device_make_bus_id(dev);
64
65         return dev;
66 }
67 EXPORT_SYMBOL(of_device_alloc);
68
69 int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
70 {
71         struct of_device *ofdev;
72         const char *compat;
73         int seen = 0, cplen, sl;
74
75         if (!dev)
76                 return -ENODEV;
77
78         ofdev = to_of_device(dev);
79
80         if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
81                 return -ENOMEM;
82
83         if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
84                 return -ENOMEM;
85
86         /* Since the compatible field can contain pretty much anything
87          * it's not really legal to split it out with commas. We split it
88          * up using a number of environment variables instead. */
89
90         compat = of_get_property(ofdev->node, "compatible", &cplen);
91         while (compat && *compat && cplen > 0) {
92                 if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
93                         return -ENOMEM;
94
95                 sl = strlen(compat) + 1;
96                 compat += sl;
97                 cplen -= sl;
98                 seen++;
99         }
100
101         if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
102                 return -ENOMEM;
103
104         /* modalias is trickier, we add it in 2 steps */
105         if (add_uevent_var(env, "MODALIAS="))
106                 return -ENOMEM;
107         sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
108                                     sizeof(env->buf) - env->buflen);
109         if (sl >= (sizeof(env->buf) - env->buflen))
110                 return -ENOMEM;
111         env->buflen += sl;
112
113         return 0;
114 }
115 EXPORT_SYMBOL(of_device_uevent);