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authorAndi Kleen <andi@firstfloor.org>2008-07-01 12:48:42 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-07-22 00:55:02 -0400
commit9800794ac11d4646384b3a310dfd1fe2eed577bf (patch)
treee52c9c91d636c2d3e7891e4edee7e50f1a1ea5d1 /drivers/base/sys.c
parent4a0b2b4dbe1335b8b9886ba3dc85a145d5d938ed (diff)
sysdev: Add utility functions for simple int/ulong variable sysdev attributes
This adds a new sysdev_ext_attribute that stores a pointer to the variable it manages and some utility functions/macro to easily use them. Previously all users wrote custom macros to generate show/store functions for each variable, with this it is possible to avoid that in many cases. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/sys.c')
-rw-r--r--drivers/base/sys.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index dc7dace14e1c..40fc14f03540 100644
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -479,3 +479,52 @@ int __init system_bus_init(void)
479 479
480EXPORT_SYMBOL_GPL(sysdev_register); 480EXPORT_SYMBOL_GPL(sysdev_register);
481EXPORT_SYMBOL_GPL(sysdev_unregister); 481EXPORT_SYMBOL_GPL(sysdev_unregister);
482
483#define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr)
484
485ssize_t sysdev_store_ulong(struct sys_device *sysdev,
486 struct sysdev_attribute *attr,
487 const char *buf, size_t size)
488{
489 struct sysdev_ext_attribute *ea = to_ext_attr(attr);
490 char *end;
491 unsigned long new = simple_strtoul(buf, &end, 0);
492 if (end == buf)
493 return -EINVAL;
494 *(unsigned long *)(ea->var) = new;
495 return end - buf;
496}
497EXPORT_SYMBOL_GPL(sysdev_store_ulong);
498
499ssize_t sysdev_show_ulong(struct sys_device *sysdev,
500 struct sysdev_attribute *attr,
501 char *buf)
502{
503 struct sysdev_ext_attribute *ea = to_ext_attr(attr);
504 return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
505}
506EXPORT_SYMBOL_GPL(sysdev_show_ulong);
507
508ssize_t sysdev_store_int(struct sys_device *sysdev,
509 struct sysdev_attribute *attr,
510 const char *buf, size_t size)
511{
512 struct sysdev_ext_attribute *ea = to_ext_attr(attr);
513 char *end;
514 long new = simple_strtol(buf, &end, 0);
515 if (end == buf || new > INT_MAX || new < INT_MIN)
516 return -EINVAL;
517 *(int *)(ea->var) = new;
518 return end - buf;
519}
520EXPORT_SYMBOL_GPL(sysdev_store_int);
521
522ssize_t sysdev_show_int(struct sys_device *sysdev,
523 struct sysdev_attribute *attr,
524 char *buf)
525{
526 struct sysdev_ext_attribute *ea = to_ext_attr(attr);
527 return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
528}
529EXPORT_SYMBOL_GPL(sysdev_show_int);
530