driver-core: Add device node pointer to struct device
[linux-2.6.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         const u32 *reg;
17         u64 addr;
18         int magic;
19
20         /*
21          * For MMIO, get the physical address
22          */
23         reg = of_get_property(node, "reg", NULL);
24         if (reg) {
25                 addr = of_translate_address(node, reg);
26                 if (addr != OF_BAD_ADDR) {
27                         dev_set_name(&dev->dev, "%llx.%s",
28                                      (unsigned long long)addr, node->name);
29                         return;
30                 }
31         }
32
33         /*
34          * No BusID, use the node name and add a globally incremented
35          * counter (and pray...)
36          */
37         magic = atomic_add_return(1, &bus_no_reg_magic);
38         dev_set_name(&dev->dev, "%s.%d", node->name, magic - 1);
39 }
40 EXPORT_SYMBOL(of_device_make_bus_id);
41
42 struct of_device *of_device_alloc(struct device_node *np,
43                                   const char *bus_id,
44                                   struct device *parent)
45 {
46         struct of_device *dev;
47
48         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
49         if (!dev)
50                 return NULL;
51
52         dev->node = of_node_get(np);
53         dev->dev.dma_mask = &dev->dma_mask;
54         dev->dev.parent = parent;
55         dev->dev.release = of_release_dev;
56         dev->dev.archdata.of_node = np;
57         dev->dev.of_node = np;
58
59         if (bus_id)
60                 dev_set_name(&dev->dev, bus_id);
61         else
62                 of_device_make_bus_id(dev);
63
64         return dev;
65 }
66 EXPORT_SYMBOL(of_device_alloc);
67
68 int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
69 {
70         struct of_device *ofdev;
71         const char *compat;
72         int seen = 0, cplen, sl;
73
74         if (!dev)
75                 return -ENODEV;
76
77         ofdev = to_of_device(dev);
78
79         if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
80                 return -ENOMEM;
81
82         if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
83                 return -ENOMEM;
84
85         /* Since the compatible field can contain pretty much anything
86          * it's not really legal to split it out with commas. We split it
87          * up using a number of environment variables instead. */
88
89         compat = of_get_property(ofdev->node, "compatible", &cplen);
90         while (compat && *compat && cplen > 0) {
91                 if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
92                         return -ENOMEM;
93
94                 sl = strlen(compat) + 1;
95                 compat += sl;
96                 cplen -= sl;
97                 seen++;
98         }
99
100         if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
101                 return -ENOMEM;
102
103         /* modalias is trickier, we add it in 2 steps */
104         if (add_uevent_var(env, "MODALIAS="))
105                 return -ENOMEM;
106         sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
107                                     sizeof(env->buf) - env->buflen);
108         if (sl >= (sizeof(env->buf) - env->buflen))
109                 return -ENOMEM;
110         env->buflen += sl;
111
112         return 0;
113 }
114 EXPORT_SYMBOL(of_device_uevent);