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-rw-r--r--arch/powerpc/kernel/ibmebus.c167
-rw-r--r--include/asm-powerpc/ibmebus.h2
2 files changed, 134 insertions, 35 deletions
diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
index 061df3a..8ed1163 100644
--- a/arch/powerpc/kernel/ibmebus.c
+++ b/arch/powerpc/kernel/ibmebus.c
@@ -2,6 +2,7 @@
* IBM PowerPC IBM eBus Infrastructure Support.
*
* Copyright (c) 2005 IBM Corporation
+ * Joachim Fenkes <fenkes@de.ibm.com>
* Heiko J Schick <schickhj@de.ibm.com>
*
* All rights reserved.
@@ -43,12 +44,14 @@
#include <asm/ibmebus.h>
#include <asm/abs_addr.h>
-static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */
- .name = ibmebus_bus_device.ofdev.dev.bus_id,
- .ofdev.dev.bus_id = "ibmebus",
- .ofdev.dev.bus = &ibmebus_bus_type,
+#define MAX_LOC_CODE_LENGTH 80
+
+static struct device ibmebus_bus_device = { /* fake "parent" device */
+ .bus_id = "ibmebus",
};
+struct bus_type ibmebus_bus_type;
+
static void *ibmebus_alloc_coherent(struct device *dev,
size_t size,
dma_addr_t *dma_handle,
@@ -158,21 +161,12 @@ static void __devinit ibmebus_dev_release(struct device *dev)
kfree(to_ibmebus_dev(dev));
}
-static ssize_t ibmebusdev_show_name(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name);
-}
-static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name,
- NULL);
-
-static struct ibmebus_dev* __devinit ibmebus_register_device_common(
+static int __devinit ibmebus_register_device_common(
struct ibmebus_dev *dev, const char *name)
{
int err = 0;
- dev->name = name;
- dev->ofdev.dev.parent = &ibmebus_bus_device.ofdev.dev;
+ dev->ofdev.dev.parent = &ibmebus_bus_device;
dev->ofdev.dev.bus = &ibmebus_bus_type;
dev->ofdev.dev.release = ibmebus_dev_release;
@@ -186,12 +180,10 @@ static struct ibmebus_dev* __devinit ibmebus_register_device_common(
if ((err = of_device_register(&dev->ofdev)) != 0) {
printk(KERN_ERR "%s: failed to register device (%d).\n",
__FUNCTION__, err);
- return NULL;
+ return -ENODEV;
}
- device_create_file(&dev->ofdev.dev, &dev_attr_name);
-
- return dev;
+ return 0;
}
static struct ibmebus_dev* __devinit ibmebus_register_device_node(
@@ -205,18 +197,18 @@ static struct ibmebus_dev* __devinit ibmebus_register_device_node(
if (!loc_code) {
printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
__FUNCTION__, dn->name ? dn->name : "<unknown>");
- return NULL;
+ return ERR_PTR(-EINVAL);
}
if (strlen(loc_code) == 0) {
printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
__FUNCTION__);
- return NULL;
+ return ERR_PTR(-EINVAL);
}
dev = kzalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
if (!dev) {
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
dev->ofdev.node = of_node_get(dn);
@@ -227,9 +219,9 @@ static struct ibmebus_dev* __devinit ibmebus_register_device_node(
min(length, BUS_ID_SIZE - 1));
/* Register with generic device framework. */
- if (ibmebus_register_device_common(dev, dn->name) == NULL) {
+ if (ibmebus_register_device_common(dev, dn->name) != 0) {
kfree(dev);
- return NULL;
+ return ERR_PTR(-ENODEV);
}
return dev;
@@ -240,9 +232,8 @@ static void ibmebus_probe_of_nodes(char* name)
struct device_node *dn = NULL;
while ((dn = of_find_node_by_name(dn, name))) {
- if (ibmebus_register_device_node(dn) == NULL) {
+ if (IS_ERR(ibmebus_register_device_node(dn))) {
of_node_put(dn);
-
return;
}
}
@@ -262,9 +253,15 @@ static void ibmebus_add_devices_by_id(struct of_device_id *idt)
return;
}
-static int ibmebus_match_helper(struct device *dev, void *data)
+static int ibmebus_match_helper_name(struct device *dev, void *data)
{
- if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0)
+ const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
+ char *name;
+
+ name = (char*)get_property(
+ ebus_dev->ofdev.node, "name", NULL);
+
+ if (name && (strcmp((char*)data, name) == 0))
return 1;
return 0;
@@ -272,7 +269,6 @@ static int ibmebus_match_helper(struct device *dev, void *data)
static int ibmebus_unregister_device(struct device *dev)
{
- device_remove_file(dev, &dev_attr_name);
of_device_unregister(to_of_device(dev));
return 0;
@@ -285,11 +281,10 @@ 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))) {
+ ibmebus_match_helper_name))) {
ibmebus_unregister_device(dev);
}
idt++;
-
}
return;
@@ -307,6 +302,9 @@ int ibmebus_register_driver(struct ibmebus_driver *drv)
if ((err = driver_register(&drv->driver) != 0))
return err;
+ /* remove all supported devices first, in case someone
+ * probed them manually before registering the driver */
+ ibmebus_remove_devices_by_id(drv->id_table);
ibmebus_add_devices_by_id(drv->id_table);
return 0;
@@ -361,9 +359,110 @@ static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
return 0;
}
+static ssize_t name_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
+ char *name = (char*)get_property(ebus_dev->ofdev.node, "name", NULL);
+ return sprintf(buf, "%s\n", name);
+}
+
+static struct device_attribute ibmebus_dev_attrs[] = {
+ __ATTR_RO(name),
+ __ATTR_NULL
+};
+
+static int ibmebus_match_helper_loc_code(struct device *dev, void *data)
+{
+ const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
+ char *loc_code;
+
+ loc_code = (char*)get_property(
+ ebus_dev->ofdev.node, "ibm,loc-code", NULL);
+
+ if (loc_code && (strcmp((char*)data, loc_code) == 0))
+ return 1;
+
+ return 0;
+}
+
+static ssize_t ibmebus_store_probe(struct bus_type *bus,
+ const char *buf, size_t count)
+{
+ struct device_node *dn = NULL;
+ struct ibmebus_dev *dev;
+ 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;
+ }
+
+ while ((dn = of_find_all_nodes(dn))) {
+ loc_code = (char *)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 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;
+}
+
+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];
+
+ 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))) {
+ ibmebus_unregister_device(dev);
+ } else {
+ printk(KERN_WARNING "%s: loc_code %s not on the bus\n",
+ __FUNCTION__, parm);
+ return -ENODEV;
+ }
+
+ return count;
+}
+
+static struct bus_attribute ibmebus_bus_attrs[] = {
+ __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
+ __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
+ __ATTR_NULL
+};
+
struct bus_type ibmebus_bus_type = {
- .name = "ibmebus",
- .match = ibmebus_bus_match,
+ .name = "ibmebus",
+ .match = ibmebus_bus_match,
+ .dev_attrs = ibmebus_dev_attrs,
+ .bus_attrs = ibmebus_bus_attrs
};
EXPORT_SYMBOL(ibmebus_bus_type);
@@ -380,7 +479,7 @@ static int __init ibmebus_bus_init(void)
return err;
}
- err = device_register(&ibmebus_bus_device.ofdev.dev);
+ err = device_register(&ibmebus_bus_device);
if (err) {
printk(KERN_WARNING "%s: device_register returned %i\n",
__FUNCTION__, err);
diff --git a/include/asm-powerpc/ibmebus.h b/include/asm-powerpc/ibmebus.h
index 8d3c9e3..87d396e 100644
--- a/include/asm-powerpc/ibmebus.h
+++ b/include/asm-powerpc/ibmebus.h
@@ -2,6 +2,7 @@
* IBM PowerPC eBus Infrastructure Support.
*
* Copyright (c) 2005 IBM Corporation
+ * Joachim Fenkes <fenkes@de.ibm.com>
* Heiko J Schick <schickhj@de.ibm.com>
*
* All rights reserved.
@@ -47,7 +48,6 @@
extern struct bus_type ibmebus_bus_type;
struct ibmebus_dev {
- const char *name;
struct of_device ofdev;
};
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