114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/of.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of_device.h>
|
|
|
|
#include <linux/errno.h>
|
|
|
|
void of_device_make_bus_id(struct of_device *dev)
|
|
{
|
|
static atomic_t bus_no_reg_magic;
|
|
struct device_node *node = dev->node;
|
|
const u32 *reg;
|
|
u64 addr;
|
|
int magic;
|
|
|
|
/*
|
|
* For MMIO, get the physical address
|
|
*/
|
|
reg = of_get_property(node, "reg", NULL);
|
|
if (reg) {
|
|
addr = of_translate_address(node, reg);
|
|
if (addr != OF_BAD_ADDR) {
|
|
dev_set_name(&dev->dev, "%llx.%s",
|
|
(unsigned long long)addr, node->name);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* No BusID, use the node name and add a globally incremented
|
|
* counter (and pray...)
|
|
*/
|
|
magic = atomic_add_return(1, &bus_no_reg_magic);
|
|
dev_set_name(&dev->dev, "%s.%d", node->name, magic - 1);
|
|
}
|
|
EXPORT_SYMBOL(of_device_make_bus_id);
|
|
|
|
struct of_device *of_device_alloc(struct device_node *np,
|
|
const char *bus_id,
|
|
struct device *parent)
|
|
{
|
|
struct of_device *dev;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
dev->node = of_node_get(np);
|
|
dev->dev.dma_mask = &dev->dma_mask;
|
|
dev->dev.parent = parent;
|
|
dev->dev.release = of_release_dev;
|
|
dev->dev.archdata.of_node = np;
|
|
|
|
if (bus_id)
|
|
dev_set_name(&dev->dev, bus_id);
|
|
else
|
|
of_device_make_bus_id(dev);
|
|
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(of_device_alloc);
|
|
|
|
int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct of_device *ofdev;
|
|
const char *compat;
|
|
int seen = 0, cplen, sl;
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
ofdev = to_of_device(dev);
|
|
|
|
if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
|
|
return -ENOMEM;
|
|
|
|
/* Since the compatible field can contain pretty much anything
|
|
* it's not really legal to split it out with commas. We split it
|
|
* up using a number of environment variables instead. */
|
|
|
|
compat = of_get_property(ofdev->node, "compatible", &cplen);
|
|
while (compat && *compat && cplen > 0) {
|
|
if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
|
|
return -ENOMEM;
|
|
|
|
sl = strlen(compat) + 1;
|
|
compat += sl;
|
|
cplen -= sl;
|
|
seen++;
|
|
}
|
|
|
|
if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
|
|
return -ENOMEM;
|
|
|
|
/* modalias is trickier, we add it in 2 steps */
|
|
if (add_uevent_var(env, "MODALIAS="))
|
|
return -ENOMEM;
|
|
sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
|
|
sizeof(env->buf) - env->buflen);
|
|
if (sl >= (sizeof(env->buf) - env->buflen))
|
|
return -ENOMEM;
|
|
env->buflen += sl;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(of_device_uevent);
|