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 <asm/errno.h>
13 static void of_device_make_bus_id(struct of_device *dev)
15 static atomic_t bus_no_reg_magic;
16 struct device_node *node = dev->node;
17 char *name = dev->dev.bus_id;
23 * If it's a DCR based device, use 'd' for native DCRs
24 * and 'D' for MMIO DCRs.
27 reg = of_get_property(node, "dcr-reg", NULL);
29 #ifdef CONFIG_PPC_DCR_NATIVE
30 snprintf(name, BUS_ID_SIZE, "d%x.%s",
32 #else /* CONFIG_PPC_DCR_NATIVE */
33 addr = of_translate_dcr_address(node, *reg, NULL);
34 if (addr != OF_BAD_ADDR) {
35 snprintf(name, BUS_ID_SIZE,
36 "D%llx.%s", (unsigned long long)addr,
40 #endif /* !CONFIG_PPC_DCR_NATIVE */
42 #endif /* CONFIG_PPC_DCR */
45 * For MMIO, get the physical address
47 reg = of_get_property(node, "reg", NULL);
49 addr = of_translate_address(node, reg);
50 if (addr != OF_BAD_ADDR) {
51 snprintf(name, BUS_ID_SIZE,
52 "%llx.%s", (unsigned long long)addr,
59 * No BusID, use the node name and add a globally incremented
60 * counter (and pray...)
62 magic = atomic_add_return(1, &bus_no_reg_magic);
63 snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);
66 struct of_device *of_device_alloc(struct device_node *np,
68 struct device *parent)
70 struct of_device *dev;
72 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
76 dev->node = of_node_get(np);
77 dev->dev.dma_mask = &dev->dma_mask;
78 dev->dev.parent = parent;
79 dev->dev.release = of_release_dev;
80 dev->dev.archdata.of_node = np;
81 dev->dev.archdata.numa_node = of_node_to_nid(np);
84 strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
86 of_device_make_bus_id(dev);
90 EXPORT_SYMBOL(of_device_alloc);
92 ssize_t of_device_get_modalias(struct of_device *ofdev,
93 char *str, ssize_t len)
97 ssize_t tsize, csize, repend;
100 csize = snprintf(str, len, "of:N%sT%s",
101 ofdev->node->name, ofdev->node->type);
103 /* Get compatible property if any */
104 compat = of_get_property(ofdev->node, "compatible", &cplen);
108 /* Find true end (we tolerate multiple \0 at the end */
109 for (i=(cplen-1); i>=0 && !compat[i]; i--)
115 /* Check space (need cplen+1 chars including final \0) */
116 tsize = csize + cplen;
119 if (csize>=len) /* @ the limit, all is already filled */
122 if (tsize>=len) { /* limit compat list */
127 /* Copy and do char replacement */
128 memcpy(&str[csize+1], compat, cplen);
129 for (i=csize; i<repend; i++) {
140 int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
142 struct of_device *ofdev;
144 int seen = 0, cplen, sl;
149 ofdev = to_of_device(dev);
151 if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
154 if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
157 /* Since the compatible field can contain pretty much anything
158 * it's not really legal to split it out with commas. We split it
159 * up using a number of environment variables instead. */
161 compat = of_get_property(ofdev->node, "compatible", &cplen);
162 while (compat && *compat && cplen > 0) {
163 if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
166 sl = strlen (compat) + 1;
172 if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
175 /* modalias is trickier, we add it in 2 steps */
176 if (add_uevent_var(env, "MODALIAS="))
178 sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
179 sizeof(env->buf) - env->buflen);
180 if (sl >= (sizeof(env->buf) - env->buflen))
186 EXPORT_SYMBOL(of_device_uevent);
187 EXPORT_SYMBOL(of_device_get_modalias);