1 #include <linux/string.h>
2 #include <linux/kernel.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>
10 #include <linux/errno.h>
12 void of_device_make_bus_id(struct of_device *dev)
14 static atomic_t bus_no_reg_magic;
15 struct device_node *node = dev->node;
16 char *name = dev->dev.bus_id;
22 * For MMIO, get the physical address
24 reg = of_get_property(node, "reg", NULL);
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,
36 * No BusID, use the node name and add a globally incremented
37 * counter (and pray...)
39 magic = atomic_add_return(1, &bus_no_reg_magic);
40 snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);
42 EXPORT_SYMBOL(of_device_make_bus_id);
44 struct of_device *of_device_alloc(struct device_node *np,
46 struct device *parent)
48 struct of_device *dev;
50 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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;
61 strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
63 of_device_make_bus_id(dev);
67 EXPORT_SYMBOL(of_device_alloc);
69 int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
71 struct of_device *ofdev;
73 int seen = 0, cplen, sl;
78 ofdev = to_of_device(dev);
80 if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
83 if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
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. */
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))
95 sl = strlen(compat) + 1;
101 if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
104 /* modalias is trickier, we add it in 2 steps */
105 if (add_uevent_var(env, "MODALIAS="))
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))
115 EXPORT_SYMBOL(of_device_uevent);