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authorJoachim Fenkes <fenkes@de.ibm.com>2007-03-22 17:00:46 +0100
committerPaul Mackerras <paulus@samba.org>2007-04-12 22:12:42 +0200
commit0727702a3a6a9e33db4a4f9a038327d014753b6e (patch)
tree93927603e896da1d5eb8e774502f4ac609b122ab /arch/powerpc/kernel/ibmebus.c
parent[POWERPC] DEBUG_PAGEALLOC for 64-bit (diff)
downloadlinux-0727702a3a6a9e33db4a4f9a038327d014753b6e.tar.xz
linux-0727702a3a6a9e33db4a4f9a038327d014753b6e.zip
[POWERPC] ibmebus: change probe/remove interface from using loc-code to DT path
In some cases, multiple OFDT nodes might share the same location code, so the location code is not a unique identifier for an OFDT node. Changed the ibmebus probe/remove interface to use the DT path of the device node instead of the location code. The DT path must be written into probe/remove right as it would appear in the "devspec" attribute of the ebus device: relative to the DT root, with a leading slash and without a trailing slash. One trailing newline will not hurt; multiple newlines will (like perl's chomp()). Example: Add a device "/proc/device-tree/foo@12345678" to ibmebus like this: echo /foo@12345678 > /sys/bus/ibmebus/probe Remove the device like this: echo /foo@12345678 > /sys/bus/ibmebus/remove Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/ibmebus.c')
-rw-r--r--arch/powerpc/kernel/ibmebus.c115
1 files changed, 60 insertions, 55 deletions
diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
index 48446a699ef8..9a8c9af43b22 100644
--- a/arch/powerpc/kernel/ibmebus.c
+++ b/arch/powerpc/kernel/ibmebus.c
@@ -44,8 +44,6 @@
#include <asm/ibmebus.h>
#include <asm/abs_addr.h>
-#define MAX_LOC_CODE_LENGTH 80
-
static struct device ibmebus_bus_device = { /* fake "parent" device */
.bus_id = "ibmebus",
};
@@ -253,7 +251,7 @@ static void ibmebus_add_devices_by_id(struct of_device_id *idt)
return;
}
-static int ibmebus_match_helper_name(struct device *dev, void *data)
+static int ibmebus_match_name(struct device *dev, void *data)
{
const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
const char *name;
@@ -280,7 +278,7 @@ static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
while (strlen(idt->name) > 0) {
while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
(void*)idt->name,
- ibmebus_match_helper_name))) {
+ ibmebus_match_name))) {
ibmebus_unregister_device(dev);
}
idt++;
@@ -371,17 +369,30 @@ static struct device_attribute ibmebus_dev_attrs[] = {
__ATTR_NULL
};
-static int ibmebus_match_helper_loc_code(struct device *dev, void *data)
+static int ibmebus_match_path(struct device *dev, void *data)
{
- const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
- const char *loc_code;
+ int rc;
+ struct device_node *dn =
+ of_node_get(to_ibmebus_dev(dev)->ofdev.node);
- loc_code = of_get_property(ebus_dev->ofdev.node, "ibm,loc-code", NULL);
+ rc = (dn->full_name && (strcasecmp((char*)data, dn->full_name) == 0));
- if (loc_code && (strcmp(data, loc_code) == 0))
- return 1;
+ of_node_put(dn);
+ return rc;
+}
- return 0;
+static char *ibmebus_chomp(const char *in, size_t count)
+{
+ char *out = (char*)kmalloc(count + 1, GFP_KERNEL);
+ if (!out)
+ return NULL;
+
+ memcpy(out, in, count);
+ out[count] = '\0';
+ if (out[count - 1] == '\n')
+ out[count - 1] = '\0';
+
+ return out;
}
static ssize_t ibmebus_store_probe(struct bus_type *bus,
@@ -389,65 +400,59 @@ static ssize_t ibmebus_store_probe(struct bus_type *bus,
{
struct device_node *dn = NULL;
struct ibmebus_dev *dev;
- const char *loc_code;
- char parm[MAX_LOC_CODE_LENGTH];
-
- if (count >= MAX_LOC_CODE_LENGTH)
- return -EINVAL;
- memcpy(parm, buf, count);
- parm[count] = '\0';
- if (parm[count-1] == '\n')
- parm[count-1] = '\0';
-
- if (bus_find_device(&ibmebus_bus_type, NULL, parm,
- ibmebus_match_helper_loc_code)) {
- printk(KERN_WARNING "%s: loc_code %s has already been probed\n",
- __FUNCTION__, parm);
- return -EINVAL;
+ char *path;
+ ssize_t rc;
+
+ path = ibmebus_chomp(buf, count);
+ if (!path)
+ return -ENOMEM;
+
+ if (bus_find_device(&ibmebus_bus_type, NULL, path,
+ ibmebus_match_path)) {
+ printk(KERN_WARNING "%s: %s has already been probed\n",
+ __FUNCTION__, path);
+ rc = -EINVAL;
+ goto out;
}
- while ((dn = of_find_all_nodes(dn))) {
- loc_code = of_get_property(dn, "ibm,loc-code", NULL);
- if (loc_code && (strncmp(loc_code, parm, count) == 0)) {
- dev = ibmebus_register_device_node(dn);
- if (IS_ERR(dev)) {
- of_node_put(dn);
- return PTR_ERR(dev);
- } else
- return count; /* success */
- }
+ if ((dn = of_find_node_by_path(path))) {
+ dev = ibmebus_register_device_node(dn);
+ of_node_put(dn);
+ rc = IS_ERR(dev) ? PTR_ERR(dev) : count;
+ } else {
+ printk(KERN_WARNING "%s: no such device node: %s\n",
+ __FUNCTION__, path);
+ rc = -ENODEV;
}
- /* if we drop out of the loop, the loc code was invalid */
- printk(KERN_WARNING "%s: no device with loc_code %s found\n",
- __FUNCTION__, parm);
- return -ENODEV;
+out:
+ kfree(path);
+ return rc;
}
static ssize_t ibmebus_store_remove(struct bus_type *bus,
const char *buf, size_t count)
{
struct device *dev;
- char parm[MAX_LOC_CODE_LENGTH];
+ char *path;
- if (count >= MAX_LOC_CODE_LENGTH)
- return -EINVAL;
- memcpy(parm, buf, count);
- parm[count] = '\0';
- if (parm[count-1] == '\n')
- parm[count-1] = '\0';
-
- /* The location code is unique, so we will find one device at most */
- if ((dev = bus_find_device(&ibmebus_bus_type, NULL, parm,
- ibmebus_match_helper_loc_code))) {
+ path = ibmebus_chomp(buf, count);
+ if (!path)
+ return -ENOMEM;
+
+ if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
+ ibmebus_match_path))) {
ibmebus_unregister_device(dev);
+
+ kfree(path);
+ return count;
} else {
- printk(KERN_WARNING "%s: loc_code %s not on the bus\n",
- __FUNCTION__, parm);
+ printk(KERN_WARNING "%s: %s not on the bus\n",
+ __FUNCTION__, path);
+
+ kfree(path);
return -ENODEV;
}
-
- return count;
}
static struct bus_attribute ibmebus_bus_attrs[] = {