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Module autoprobing support for virtio drivers. 

This adds the logic to convert the virtio ids into module aliases, and
includes a modalias entry in sysfs and the env var to make probing work.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2007-10-22 11:03:39 +10:00
parent 31610434bc
commit b01d9f2863
2 changed files with 36 additions and 0 deletions
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18
drivers/virtio/virtio.c
View File

@ -20,10 +20,19 @@ static ssize_t status_show(struct device *_d,
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
return sprintf(buf, "0x%08x", dev->config->get_status(dev));
}
static ssize_t modalias_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
return sprintf(buf, "virtio:d%08Xv%08X\n",
dev->id.device, dev->id.vendor);
}
static struct device_attribute virtio_dev_attrs[] = {
__ATTR_RO(device),
__ATTR_RO(vendor),
__ATTR_RO(status),
__ATTR_RO(modalias),
__ATTR_NULL
};
@ -51,10 +60,19 @@ static int virtio_dev_match(struct device *_dv, struct device_driver *_dr)
return 0;
}
static int virtio_uevent(struct device *_dv, struct kobj_uevent_env *env)
{
struct virtio_device *dev = container_of(_dv,struct virtio_device,dev);
return add_uevent_var(env, "MODALIAS=virtio:d%08Xv%08X",
dev->id.device, dev->id.vendor);
}
static struct bus_type virtio_bus = {
.name = "virtio",
.match = virtio_dev_match,
.dev_attrs = virtio_dev_attrs,
.uevent = virtio_uevent,
};
static void add_status(struct virtio_device *dev, unsigned status)

18
scripts/mod/file2alias.c
View File

@ -525,6 +525,20 @@ static int do_ssb_entry(const char *filename,
return 1;
}
/* Looks like: virtio:dNvN */
static int do_virtio_entry(const char *filename, struct virtio_device_id *id,
char *alias)
{
id->device = TO_NATIVE(id->device);
id->vendor = TO_NATIVE(id->vendor);
strcpy(alias, "virtio:");
ADD(alias, "d", 1, id->device);
ADD(alias, "v", id->vendor != VIRTIO_DEV_ANY_ID, id->vendor);
return 1;
}
/* Ignore any prefix, eg. v850 prepends _ */
static inline int sym_is(const char *symbol, const char *name)
{
@ -651,6 +665,10 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
do_table(symval, sym->st_size,
sizeof(struct ssb_device_id), "ssb",
do_ssb_entry, mod);
else if (sym_is(symname, "__mod_virtio_device_table"))
do_table(symval, sym->st_size,
sizeof(struct virtio_device_id), "virtio",
do_virtio_entry, mod);
free(zeros);
}