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uapi: map_to_7segment: Update example in documentation 

The device_attribute .show() and .store() methods gained an extra
parameter in v2.6.13, but the example in the documentation for the
7-segment header file was never updated.  Add the missing parameters.

While at it, get rid of the (misspelled) deprecated symbolic
permissions, and switch to DEVICE_ATTR_RW(), which was introduced in
v3.11

Fixes: 54b6f35c99 ("[PATCH] Driver core: change device_attribute callbacks")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20210207130543.2128980-1-geert@linux-m68k.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2021-02-07 14:05:43 +01:00 committed by Greg Kroah-Hartman
parent 61de21a831
commit 0566752c3e
1 changed files with 8 additions and 3 deletions
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11
include/uapi/linux/map_to_7segment.h
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@ -45,17 +45,22 @@
* In device drivers it is recommended, if required, to make the char map
* accessible via the sysfs interface using the following scheme:
*
* static ssize_t show_map(struct device *dev, char *buf) {
* static ssize_t map_seg7_show(struct device *dev,
* struct device_attribute *attr, char *buf)
* {
* memcpy(buf, &map_seg7, sizeof(map_seg7));
* return sizeof(map_seg7);
* }
* static ssize_t store_map(struct device *dev, const char *buf, size_t cnt) {
* static ssize_t map_seg7_store(struct device *dev,
* struct device_attribute *attr, const char *buf,
* size_t cnt)
* {
* if(cnt != sizeof(map_seg7))
* return -EINVAL;
* memcpy(&map_seg7, buf, cnt);
* return cnt;
* }
* static DEVICE_ATTR(map_seg7, PERMS_RW, show_map, store_map);
* static DEVICE_ATTR_RW(map_seg7);
*
* History:
* 2005-05-31 RFC linux-kernel@vger.kernel.org