From: Don Zickus <dzickus@xxxxxxxxxx>
This patch moves the attributes to underneath the bus device correctly.
This will help remove a bunch of cruft from the code and let the kernel
infrastructure manage the sysfs files instead of the driver.
After the move remove all the leftover code.
Signed-off-by: Don Zickus <dzickus@xxxxxxxxxx>
Signed-off-by: Benjamin Romer <benjamin.romer@xxxxxxxxxx>
---
drivers/staging/unisys/visorbus/visorbus_main.c | 266 +++++-------------------
1 file changed, 55 insertions(+), 211 deletions(-)
diff --git a/drivers/staging/unisys/visorbus/visorbus_main.c b/drivers/staging/unisys/visorbus/visorbus_main.c
index 228aec5..e299371 100644
--- a/drivers/staging/unisys/visorbus/visorbus_main.c
+++ b/drivers/staging/unisys/visorbus/visorbus_main.c
@@ -606,113 +606,8 @@ void unregister_channel_attributes(struct visor_device *dev)
kobject_put(&dev->kobjchannel);
dev->kobjchannel.parent = NULL;
}
-/* This is actually something they forgot to put in the kernel.
- * struct bus_type in the kernel SHOULD have a "busses" member, which
- * should be treated similarly to the "devices" and "drivers" members.
- * There SHOULD be:
- * - a "businst_attribute" analogous to the existing "bus_attribute"
- * - a "businst_create_file" and "businst_remove_file" analogous to the
- * existing "bus_create_file" and "bus_remove_file".
- * That's what I created businst.c and businst.h to do.
- *
- * We want to add the "busses" sub-tree in sysfs, where we will house the
- * names and properties of each bus instance:
- *
- * /sys/bus/<bustypename>/
- * version
- * devices
- * <devname1> --> /sys/devices/<businstancename><devname1>
- * <devname2> --> /sys/devices/<businstancename><devname2>
- * drivers
- * <driverinstancename1>
- * <driverinstance1property1>
- * <driverinstance1property2>
- * ...
- * <driverinstancename2>
- * <driverinstance2property1>
- * <driverinstance2property2>
- * ...
- * >> busses
- * >> <businstancename1>
- * >> <businstance1property1>
- * >> <businstance1property2>
- * >> ...
- * >> <businstancename2>
- * >> <businstance2property1>
- * >> <businstance2property2>
- * >> ...
- *
- * I considered adding bus instance properties under
- * /sys/devices/<businstancename>. But I thought there may be existing
- * notions that ONLY device sub-trees should live under
- * /sys/devices/<businstancename>. So I stayed out of there.
- *
- */
-
-struct businst_attribute {
- struct attribute attr;
- ssize_t (*show)(struct visorbus_devdata*, char *buf);
- ssize_t (*store)(struct visorbus_devdata*, const char *buf,
- size_t count);
-};
-
-#define to_businst_attr(_attr) \
- container_of(_attr, struct businst_attribute, attr)
#define to_visorbus_devdata(obj) \
- container_of(obj, struct visorbus_devdata, kobj)
-
-static ssize_t
-businst_attr_show(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- struct businst_attribute *businst_attr = to_businst_attr(attr);
- struct visorbus_devdata *bus = to_visorbus_devdata(kobj);
- ssize_t ret = 0;
-
- if (businst_attr->show)
- ret = businst_attr->show(bus, buf);
- return ret;
-}
-
-static ssize_t
-businst_attr_store(struct kobject *kobj, struct attribute *attr,
- const char *buf, size_t count)
-{
- struct businst_attribute *businst_attr = to_businst_attr(attr);
- struct visorbus_devdata *bus = to_visorbus_devdata(kobj);
- ssize_t ret = 0;
-
- if (businst_attr->store)
- ret = businst_attr->store(bus, buf, count);
- return ret;
-}
-
-static int
-businst_create_file(struct visorbus_devdata *bus,
- struct businst_attribute *attr)
-{
- return sysfs_create_file(&bus->kobj, &attr->attr);
-}
-
-static void
-businst_remove_file(struct visorbus_devdata *bus,
- struct businst_attribute *attr)
-{
- sysfs_remove_file(&bus->kobj, &attr->attr);
-}
-
-static const struct sysfs_ops businst_sysfs_ops = {
- .show = businst_attr_show,
- .store = businst_attr_store,
-};
-
-static struct kobj_type businst_kobj_type = {
- .sysfs_ops = &businst_sysfs_ops
-};
-
-static struct kset businstances = { /* should actually be a member of
- * bus_type */
-};
+ container_of(obj, struct visorbus_devdata, dev)
/* BUS type attributes
*
@@ -736,23 +631,6 @@ register_bustype_attributes(void)
int rc = 0;
rc = bus_create_file(&visorbus_type, &bustype_attr_version);
- if (rc < 0)
- goto away;
-
- /* Here we make up for the fact that bus_type does not yet have a
- * member to keep track of multiple bus instances for a given bus
- * type. This is useful for stashing properties for each bus
- * instance.
- */
- kobject_set_name(&businstances.kobj, "busses");
- businstances.kobj.ktype = &businst_kobj_type;
- businstances.kobj.parent = &visorbus_type.p->subsys.kobj;
- rc = kset_register(&businstances);
- if (rc < 0)
- goto away;
-
- rc = 0;
-away:
return rc;
}
@@ -760,7 +638,6 @@ static void
unregister_bustype_attributes(void)
{
bus_remove_file(&visorbus_type, &bustype_attr_version);
- kset_unregister(&businstances);
}
/* BUS instance attributes
@@ -774,8 +651,10 @@ unregister_bustype_attributes(void)
*
*/
-static ssize_t businst_attr_partition_handle(struct visorbus_devdata *businst,
- char *buf) {
+static ssize_t partition_handle_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf) {
+ struct visorbus_devdata *businst = to_visorbus_devdata(dev);
struct visorchipset_bus_info bus_info;
int len = 0;
@@ -786,8 +665,10 @@ static ssize_t businst_attr_partition_handle(struct visorbus_devdata *businst,
return len;
}
-static ssize_t businst_attr_partition_guid(struct visorbus_devdata *businst,
- char *buf) {
+static ssize_t partition_guid_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf) {
+ struct visorbus_devdata *businst = to_visorbus_devdata(dev);
struct visorchipset_bus_info bus_info;
int len = 0;
@@ -797,8 +678,10 @@ static ssize_t businst_attr_partition_guid(struct visorbus_devdata *businst,
return len;
}
-static ssize_t businst_attr_partition_name(struct visorbus_devdata *businst,
- char *buf) {
+static ssize_t partition_name_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf) {
+ struct visorbus_devdata *businst = to_visorbus_devdata(dev);
struct visorchipset_bus_info bus_info;
int len = 0;
@@ -809,8 +692,10 @@ static ssize_t businst_attr_partition_name(struct visorbus_devdata *businst,
return len;
}
-static ssize_t businst_attr_channel_addr(struct visorbus_devdata *businst,
- char *buf) {
+static ssize_t channel_addr_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf) {
+ struct visorbus_devdata *businst = to_visorbus_devdata(dev);
struct visorchipset_bus_info bus_info;
int len = 0;
@@ -820,8 +705,10 @@ static ssize_t businst_attr_channel_addr(struct visorbus_devdata *businst,
return len;
}
-static ssize_t businst_attr_nchannel_bytes(struct visorbus_devdata *businst,
- char *buf) {
+static ssize_t channel_bytes_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf) {
+ struct visorbus_devdata *businst = to_visorbus_devdata(dev);
struct visorchipset_bus_info bus_info;
int len = 0;
@@ -831,8 +718,10 @@ static ssize_t businst_attr_nchannel_bytes(struct visorbus_devdata *businst,
return len;
}
-static ssize_t businst_attr_channel_id(struct visorbus_devdata *businst,
- char *buf) {
+static ssize_t channel_id_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf) {
+ struct visorbus_devdata *businst = to_visorbus_devdata(dev);
int len = 0;
if (businst && businst->chan) {
@@ -843,8 +732,10 @@ static ssize_t businst_attr_channel_id(struct visorbus_devdata *businst,
return len;
}
-static ssize_t businst_attr_client_bus_info(struct visorbus_devdata *businst,
- char *buf) {
+static ssize_t client_bus_info_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf) {
+ struct visorbus_devdata *businst = to_visorbus_devdata(dev);
struct visorchipset_bus_info bus_info;
int i, x, remain = PAGE_SIZE;
unsigned long off;
@@ -903,79 +794,33 @@ static ssize_t businst_attr_client_bus_info(struct visorbus_devdata *businst,
return PAGE_SIZE - remain;
}
-static struct businst_attribute ba_partition_handle =
- __ATTR(partition_handle, S_IRUGO, businst_attr_partition_handle, NULL);
-static struct businst_attribute ba_partition_guid =
- __ATTR(partition_guid, S_IRUGO, businst_attr_partition_guid, NULL);
-static struct businst_attribute ba_partition_name =
- __ATTR(partition_name, S_IRUGO, businst_attr_partition_name, NULL);
-static struct businst_attribute ba_channel_addr =
- __ATTR(channel_addr, S_IRUGO, businst_attr_channel_addr, NULL);
-static struct businst_attribute ba_nchannel_bytes =
- __ATTR(nchannel_bytes, S_IRUGO, businst_attr_nchannel_bytes, NULL);
-static struct businst_attribute ba_channel_id =
- __ATTR(channel_id, S_IRUGO, businst_attr_channel_id, NULL);
-static struct businst_attribute ba_client_bus_info =
- __ATTR(client_bus_info, S_IRUGO, businst_attr_client_bus_info, NULL);
-
-static int
-register_businst_attributes(struct visorbus_devdata *businst)
-{
- int rc = 0;
-
- businst->kobj.kset = &businstances; /* identify parent sysfs dir */
- rc = kobject_init_and_add(&businst->kobj, &businst_kobj_type,
- NULL, "visorbus%d", businst->devno);
- if (rc < 0)
- goto away;
-
- rc = businst_create_file(businst, &ba_partition_handle);
- if (rc < 0)
- goto away;
-
- rc = businst_create_file(businst, &ba_partition_guid);
- if (rc < 0)
- goto away;
-
- rc = businst_create_file(businst, &ba_partition_name);
- if (rc < 0)
- goto away;
-
- rc = businst_create_file(businst, &ba_channel_addr);
- if (rc < 0)
- goto away;
-
- rc = businst_create_file(businst, &ba_nchannel_bytes);
- if (rc < 0)
- goto away;
-
- rc = businst_create_file(businst, &ba_channel_id);
- if (rc < 0)
- goto away;
-
- rc = businst_create_file(businst, &ba_client_bus_info);
- if (rc < 0)
- goto away;
-
- kobject_uevent(&businst->kobj, KOBJ_ADD);
+static DEVICE_ATTR_RO(partition_handle);
+static DEVICE_ATTR_RO(partition_guid);
+static DEVICE_ATTR_RO(partition_name);
+static DEVICE_ATTR_RO(channel_addr);
+static DEVICE_ATTR_RO(channel_bytes);
+static DEVICE_ATTR_RO(channel_id);
+static DEVICE_ATTR_RO(client_bus_info);
+
+static struct attribute *dev_attrs[] = {
+ &dev_attr_partition_handle.attr,
+ &dev_attr_partition_guid.attr,
+ &dev_attr_partition_name.attr,
+ &dev_attr_channel_addr.attr,
+ &dev_attr_channel_bytes.attr,
+ &dev_attr_channel_id.attr,
+ &dev_attr_client_bus_info.attr,
+ NULL
+};
- rc = 0;
-away:
- return rc;
-}
+static struct attribute_group dev_attr_grp = {
+ .attrs = dev_attrs,
+};
-static void
-unregister_businst_attributes(struct visorbus_devdata *businst)
-{
- businst_remove_file(businst, &ba_partition_handle);
- businst_remove_file(businst, &ba_partition_guid);
- businst_remove_file(businst, &ba_partition_name);
- businst_remove_file(businst, &ba_channel_addr);
- businst_remove_file(businst, &ba_nchannel_bytes);
- businst_remove_file(businst, &ba_channel_id);
- businst_remove_file(businst, &ba_client_bus_info);
- kobject_put(&businst->kobj);
-}
+static const struct attribute_group *visorbus_groups[] = {
+ &dev_attr_grp,
+ NULL
+};
/* DRIVER attributes
*
@@ -1646,6 +1491,7 @@ create_bus_instance(int id)
goto away;
}
dev_set_name(&devdata->dev, "visorbus%d", id);
+ devdata->dev.groups = visorbus_groups;
devdata->dev.release = visorbus_release_busdevice;
if (device_register(&devdata->dev) < 0) {
POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, id,
@@ -1692,7 +1538,6 @@ create_bus_instance(int id)
}
}
}
- register_businst_attributes(devdata);
bus_count++;
list_add_tail(&devdata->list_all, &list_all_bus_instances);
if (id == 0)
@@ -1715,7 +1560,6 @@ remove_bus_instance(struct visorbus_devdata *devdata)
* successfully been able to trace thru the code to see where/how
* release() gets called. But I know it does.
*/
- unregister_businst_attributes(devdata);
bus_count--;
if (devdata->chan) {
visorchannel_destroy(devdata->chan);
--
2.1.4
_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
