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authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-06 11:36:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-06 11:36:30 -0700
commitab69bcd66fb4be64edfc767365cb9eb084961246 (patch)
treef7623585aee58978fc7814460fff517ec39138f2 /Documentation
parentc513b67e68787eceafeede32bcd0edbee45c0006 (diff)
parent6937e8f8c0135f2325194c372ada6dc655499992 (diff)
downloadlinux-ab69bcd66fb4be64edfc767365cb9eb084961246.tar.bz2
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (28 commits) driver core: device_rename's new_name can be const sysfs: Remove owner field from sysfs struct attribute powerpc/pci: Remove owner field from attribute initialization in PCI bridge init regulator: Remove owner field from attribute initialization in regulator core driver leds: Remove owner field from attribute initialization in bd2802 driver scsi: Remove owner field from attribute initialization in ARCMSR driver scsi: Remove owner field from attribute initialization in LPFC driver cgroupfs: create /sys/fs/cgroup to mount cgroupfs on Driver core: Add BUS_NOTIFY_BIND_DRIVER driver core: fix memory leak on one error path in bus_register() debugfs: no longer needs to depend on SYSFS sysfs: Fix one more signature discrepancy between sysfs implementation and docs. sysfs: fix discrepancies between implementation and documentation dcdbas: remove a redundant smi_data_buf_free in dcdbas_exit dmi-id: fix a memory leak in dmi_id_init error path sysfs: sysfs_chmod_file's attr can be const firmware: Update hotplug script Driver core: move platform device creation helpers to .init.text (if MODULE=n) Driver core: reduce duplicated code for platform_device creation Driver core: use kmemdup in platform_device_add_resources ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/DocBook/device-drivers.tmpl1
-rw-r--r--Documentation/filesystems/sysfs.txt46
-rw-r--r--Documentation/firmware_class/hotplug-script17
3 files changed, 36 insertions, 28 deletions
diff --git a/Documentation/DocBook/device-drivers.tmpl b/Documentation/DocBook/device-drivers.tmpl
index 1b2dd4fc3db2..ecd35e9d4410 100644
--- a/Documentation/DocBook/device-drivers.tmpl
+++ b/Documentation/DocBook/device-drivers.tmpl
@@ -111,6 +111,7 @@ X!Edrivers/base/attribute_container.c
<!--
X!Edrivers/base/interface.c
-->
+!Iinclude/linux/platform_device.h
!Edrivers/base/platform.c
!Edrivers/base/bus.c
</sect1>
diff --git a/Documentation/filesystems/sysfs.txt b/Documentation/filesystems/sysfs.txt
index 931c806642c5..5d1335faec2d 100644
--- a/Documentation/filesystems/sysfs.txt
+++ b/Documentation/filesystems/sysfs.txt
@@ -4,7 +4,7 @@ sysfs - _The_ filesystem for exporting kernel objects.
Patrick Mochel <mochel@osdl.org>
Mike Murphy <mamurph@cs.clemson.edu>
-Revised: 22 February 2009
+Revised: 15 July 2010
Original: 10 January 2003
@@ -124,7 +124,7 @@ show and store methods of the attribute owners.
struct sysfs_ops {
ssize_t (*show)(struct kobject *, struct attribute *, char *);
- ssize_t (*store)(struct kobject *, struct attribute *, const char *);
+ ssize_t (*store)(struct kobject *, struct attribute *, const char *, size_t);
};
[ Subsystems should have already defined a struct kobj_type as a
@@ -139,18 +139,22 @@ calls the associated methods.
To illustrate:
+#define to_dev(obj) container_of(obj, struct device, kobj)
#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
-#define to_dev(d) container_of(d, struct device, kobj)
-static ssize_t
-dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
{
- struct device_attribute * dev_attr = to_dev_attr(attr);
- struct device * dev = to_dev(kobj);
- ssize_t ret = 0;
+ struct device_attribute *dev_attr = to_dev_attr(attr);
+ struct device *dev = to_dev(kobj);
+ ssize_t ret = -EIO;
if (dev_attr->show)
- ret = dev_attr->show(dev, buf);
+ ret = dev_attr->show(dev, dev_attr, buf);
+ if (ret >= (ssize_t)PAGE_SIZE) {
+ print_symbol("dev_attr_show: %s returned bad count\n",
+ (unsigned long)dev_attr->show);
+ }
return ret;
}
@@ -163,10 +167,9 @@ To read or write attributes, show() or store() methods must be
specified when declaring the attribute. The method types should be as
simple as those defined for device attributes:
-ssize_t (*show)(struct device * dev, struct device_attribute * attr,
- char * buf);
-ssize_t (*store)(struct device * dev, struct device_attribute * attr,
- const char * buf);
+ssize_t (*show)(struct device *dev, struct device_attribute *attr, char *buf);
+ssize_t (*store)(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count);
IOW, they should take only an object, an attribute, and a buffer as parameters.
@@ -209,8 +212,8 @@ Other notes:
- show() should always use snprintf().
-- store() should return the number of bytes used from the buffer. This
- can be done using strlen().
+- store() should return the number of bytes used from the buffer. If the
+ entire buffer has been used, just return the count argument.
- show() or store() can always return errors. If a bad value comes
through, be sure to return an error.
@@ -223,15 +226,18 @@ Other notes:
A very simple (and naive) implementation of a device attribute is:
-static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_name(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", dev->name);
}
-static ssize_t store_name(struct device * dev, const char * buf)
+static ssize_t store_name(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
{
- sscanf(buf, "%20s", dev->name);
- return strnlen(buf, PAGE_SIZE);
+ snprintf(dev->name, sizeof(dev->name), "%.*s",
+ (int)min(count, sizeof(dev->name) - 1), buf);
+ return count;
}
static DEVICE_ATTR(name, S_IRUGO, show_name, store_name);
@@ -327,7 +333,7 @@ Structure:
struct bus_attribute {
struct attribute attr;
ssize_t (*show)(struct bus_type *, char * buf);
- ssize_t (*store)(struct bus_type *, const char * buf);
+ ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
};
Declaring:
diff --git a/Documentation/firmware_class/hotplug-script b/Documentation/firmware_class/hotplug-script
index 1990130f2ab1..8143a950b607 100644
--- a/Documentation/firmware_class/hotplug-script
+++ b/Documentation/firmware_class/hotplug-script
@@ -6,11 +6,12 @@
HOTPLUG_FW_DIR=/usr/lib/hotplug/firmware/
-echo 1 > /sys/$DEVPATH/loading
-cat $HOTPLUG_FW_DIR/$FIRMWARE > /sys/$DEVPATH/data
-echo 0 > /sys/$DEVPATH/loading
-
-# To cancel the load in case of error:
-#
-# echo -1 > /sys/$DEVPATH/loading
-#
+if [ "$SUBSYSTEM" == "firmware" -a "$ACTION" == "add" ]; then
+ if [ -f $HOTPLUG_FW_DIR/$FIRMWARE ]; then
+ echo 1 > /sys/$DEVPATH/loading
+ cat $HOTPLUG_FW_DIR/$FIRMWARE > /sys/$DEVPATH/data
+ echo 0 > /sys/$DEVPATH/loading
+ else
+ echo -1 > /sys/$DEVPATH/loading
+ fi
+fi