EXPORT_SYMBOL(of_find_matching_node);
/**
- * of_modalias_table: Table of explicit compatible ==> modalias mappings
- *
- * This table allows particulare compatible property values to be mapped
- * to modalias strings. This is useful for busses which do not directly
- * understand the OF device tree but are populated based on data contained
- * within the device tree. SPI and I2C are the two current users of this
- * table.
- *
- * In most cases, devices do not need to be listed in this table because
- * the modalias value can be derived directly from the compatible table.
- * However, if for any reason a value cannot be derived, then this table
- * provides a method to override the implicit derivation.
- *
- * At the moment, a single table is used for all bus types because it is
- * assumed that the data size is small and that the compatible values
- * should already be distinct enough to differentiate between SPI, I2C
- * and other devices.
- */
-struct of_modalias_table {
- char *of_device;
- char *modalias;
-};
-static struct of_modalias_table of_modalias_table[] = {
- { "fsl,mcu-mpc8349emitx", "mcu-mpc8349emitx" },
- { "mmc-spi-slot", "mmc_spi" },
-};
-
-/**
* 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 determine
- * an appropriate modalias value for a particular device tree node. Two
- * separate methods are attempted to derive a 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.
*
- * First method is to lookup the compatible value in of_modalias_table.
- * Second is to strip off the manufacturer prefix from the first
- * compatible entry and use the remainder as modalias
- *
- * This routine returns 0 on success
+ * This routine returns 0 on success, <0 on failure.
*/
int of_modalias_node(struct device_node *node, char *modalias, int len)
{
- int i, cplen;
- const char *compatible;
- const char *p;
-
- /* 1. search for exception list entry */
- for (i = 0; i < ARRAY_SIZE(of_modalias_table); i++) {
- compatible = of_modalias_table[i].of_device;
- if (!of_device_is_compatible(node, compatible))
- continue;
- strlcpy(modalias, of_modalias_table[i].modalias, len);
- return 0;
- }
+ const char *compatible, *p;
+ int cplen;
compatible = of_get_property(node, "compatible", &cplen);
- if (!compatible)
+ if (!compatible || strlen(compatible) > cplen)
return -ENODEV;
-
- /* 2. take first compatible entry and strip manufacturer */
p = strchr(compatible, ',');
- if (!p)
- return -ENODEV;
- p++;
- strlcpy(modalias, p, len);
+ strlcpy(modalias, p ? p + 1 : compatible, len);
return 0;
}
EXPORT_SYMBOL_GPL(of_modalias_node);