[PATCH] I2C: add i2c module alias for i2c drivers to use

This is the start of adding hotplug-like support for i2c devices.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

include/linux/i2c.h

@@ -29,6 +29,7 @@
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/i2c-id.h>
+#include <linux/mod_devicetable.h>
 #include <linux/device.h>	/* for struct device */
 #include <asm/semaphore.h>
 

include/linux/mod_devicetable.h

@@ -244,4 +244,9 @@ struct pcmcia_device_id {
 #define PCMCIA_DEV_ID_MATCH_FAKE_CIS	0x0200
 #define PCMCIA_DEV_ID_MATCH_ANONYMOUS	0x0400
 
+/* I2C */
+struct i2c_device_id {
+	__u16 id;
+};
+
 #endif /* LINUX_MOD_DEVICETABLE_H */

scripts/mod/file2alias.c

@@ -359,6 +359,13 @@ static int do_vio_entry(const char *filename, struct vio_device_id *vio,
 	return 1;
 }
 
+static int do_i2c_entry(const char *filename, struct i2c_device_id *i2c, char *alias)
+{
+	strcpy(alias, "i2c:");
+	ADD(alias, "id", 1, i2c->id);
+	return 1;
+}
+
 /* Ignore any prefix, eg. v850 prepends _ */
 static inline int sym_is(const char *symbol, const char *name)
 {
@@ -443,6 +450,9 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
         else if (sym_is(symname, "__mod_vio_device_table"))
 		do_table(symval, sym->st_size, sizeof(struct vio_device_id),
 			 do_vio_entry, mod);
+	else if (sym_is(symname, "__mod_i2c_device_table"))
+		do_table(symval, sym->st_size, sizeof(struct i2c_device_id),
+			 do_i2c_entry, mod);
 
 }