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    SubjectRe: [PATCH] exporting capability code/name pairs (try #6.1)
    >> Could you also modify the documentation and the sample code to use this
    >> new field, showing how it is to be used, and testing that it works
    >> properly at the same time?
    >
    > OK, Please wait for a while.

    [3/3] Add a new example of kobject/attribute

    The attached patch can provide a new exmple to use kobject and attribute.
    The _show() and _store() method can refer/store the private data field of
    kobj_attribute structure to know what entries are refered by users.
    It will make easier to share a single _show()/_store() method with several
    entries.

    Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
    --
    samples/kobject/kobject-example.c | 32 ++++++++++++++++++++++++++++++++
    1 files changed, 32 insertions(+), 0 deletions(-)

    diff --git a/samples/kobject/kobject-example.c b/samples/kobject/kobject-example.c
    index 08d0d3f..f99d734 100644
    --- a/samples/kobject/kobject-example.c
    +++ b/samples/kobject/kobject-example.c
    @@ -77,6 +77,35 @@ static struct kobj_attribute baz_attribute =
    static struct kobj_attribute bar_attribute =
    __ATTR(bar, 0666, b_show, b_store);

    +/*
    + * You can store a private data within 'data' field of kobj_attribute.
    + * It enables to share a single _show() or _store() method with several
    + * entries.
    + */
    +static ssize_t integer_show(struct kobject *kobj,
    + struct kobj_attribute *attr,
    + char *buf)
    +{
    + return scnprintf(buf, PAGE_SIZE, "%d\n", (int) attr->data);
    +}
    +
    +static ssize_t integer_store(struct kobject *kobj,
    + struct kobj_attribute *attr,
    + const char *buf, size_t count)
    +{
    + int code;
    +
    + sscanf(buf, "%du", &code);
    + attr->data = (void *) code;
    + return count;
    +}
    +
    +static struct kobj_attribute hoge_attribute =
    + __ATTR_DATA(hoge, 0666, integer_show, integer_store, 123);
    +static struct kobj_attribute piyo_attribute =
    + __ATTR_DATA(piyo, 0666, integer_show, integer_store, 456);
    +static struct kobj_attribute fuga_attribute =
    + __ATTR_DATA(fuga, 0444, integer_show, NULL, 789);

    /*
    * Create a group of attributes so that we can create and destory them all
    @@ -86,6 +115,9 @@ static struct attribute *attrs[] = {
    &foo_attribute.attr,
    &baz_attribute.attr,
    &bar_attribute.attr,
    + &hoge_attribute.attr,
    + &piyo_attribute.attr,
    + &fuga_attribute.attr,
    NULL, /* need to NULL terminate the list of attributes */
    };

    --
    OSS Platform Development Division, NEC
    KaiGai Kohei <kaigai@ak.jp.nec.com>

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