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of: Add of_modalias_node function 

Directly from the Kernel.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2013-05-31 15:47:14 +02:00
parent 5b79ceee57
commit 75ea5f1c0f
2 changed files with 29 additions and 0 deletions
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27
drivers/of/base.c
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@ -625,6 +625,33 @@ int of_property_read_string_index(struct device_node *np, const char *propname,
}
EXPORT_SYMBOL_GPL(of_property_read_string_index);
/**
* of_modalias_node - Lookup appropriate modalias for a device node
* @node: pointer to a device tree node
* @modalias: Pointer to buffer that modalias value will be copied into
* @len: Length of modalias value
*
* Based on the value of the compatible property, this routine will attempt
* to choose an appropriate modalias value for a particular device tree node.
* It does this by stripping the manufacturer prefix (as delimited by a ',')
* from the first entry in the compatible list property.
*
* This routine returns 0 on success, <0 on failure.
*/
int of_modalias_node(struct device_node *node, char *modalias, int len)
{
const char *compatible, *p;
int cplen;
compatible = of_get_property(node, "compatible", &cplen);
if (!compatible || strlen(compatible) > cplen)
return -ENODEV;
p = strchr(compatible, ',');
strlcpy(modalias, p ? p + 1 : compatible, len);
return 0;
}
EXPORT_SYMBOL_GPL(of_modalias_node);
struct device_node *of_get_root_node(void)
{
return root_node;

2
include/of.h
View File

@ -72,6 +72,8 @@ struct fdt_header *fdt_get_tree(void);
struct fdt_header *of_get_fixed_tree(struct device_node *node);
int of_modalias_node(struct device_node *node, char *modalias, int len);
#define device_node_for_nach_child(node, child) \
list_for_each_entry(child, &node->children, parent_list)