1 files changed, 71 insertions, 14 deletions

diff --git a/include/asm-powerpc/pmac_low_i2c.h b/include/asm-powerpc/pmac_low_i2c.h
index 3fb8d51540dd..adf4fa956572 100644
--- a/include/asm-powerpc/pmac_low_i2c.h
+++ b/include/asm-powerpc/pmac_low_i2c.h
@@ -15,30 +15,87 @@
 
 /* i2c mode (based on the platform functions format) */
 enum {
-        pmac_low_i2c_mode_dumb          = 1,
-        pmac_low_i2c_mode_std           = 2,
-        pmac_low_i2c_mode_stdsub        = 3,
-        pmac_low_i2c_mode_combined      = 4,
+        pmac_i2c_mode_dumb      = 1,
+        pmac_i2c_mode_std       = 2,
+        pmac_i2c_mode_stdsub    = 3,
+        pmac_i2c_mode_combined  = 4,
 };
 
 /* RW bit in address */
 enum {
-        pmac_low_i2c_read               = 0x01,
-        pmac_low_i2c_write              = 0x00
+        pmac_i2c_read           = 0x01,
+        pmac_i2c_write          = 0x00
 };
 
+/* i2c bus type */
+enum {
+        pmac_i2c_bus_keywest    = 0,
+        pmac_i2c_bus_pmu        = 1,
+        pmac_i2c_bus_smu        = 2,
+};
+
+/* i2c bus features */
+enum {
+        /* can_largesub : supports >1 byte subaddresses (SMU only) */
+        pmac_i2c_can_largesub   = 0x00000001u,
+
+        /* multibus : device node holds multiple busses, bus number is
+         * encoded in bits 0xff00 of "reg" of a given device
+         */
+        pmac_i2c_multibus       = 0x00000002u,
+};
+
+/* i2c busses in the system */
+struct pmac_i2c_bus;
+struct i2c_adapter;
+
 /* Init, called early during boot */
-extern void pmac_init_low_i2c(void);
+extern int pmac_i2c_init(void);
+
+/* Lookup an i2c bus for a device-node. The node can be either the bus
+ * node itself or a device below it. In the case of a multibus, the bus
+ * node itself is the controller node, else, it's a child of the controller
+ * node
+ */
+extern struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node);
+
+/* Get the address for an i2c device. This strips the bus number if
+ * necessary. The 7 bits address is returned 1 bit right shifted so that the
+ * direction can be directly ored in
+ */
+extern u8 pmac_i2c_get_dev_addr(struct device_node *device);
+
+/* Get infos about a bus */
+extern struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus);
+extern struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus);
+extern int pmac_i2c_get_type(struct pmac_i2c_bus *bus);
+extern int pmac_i2c_get_flags(struct pmac_i2c_bus *bus);
+
+/* i2c layer adapter attach/detach */
+extern void pmac_i2c_attach_adapter(struct pmac_i2c_bus *bus,
+                                    struct i2c_adapter *adapter);
+extern void pmac_i2c_detach_adapter(struct pmac_i2c_bus *bus,
+                                    struct i2c_adapter *adapter);
+extern struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus);
+
+/* March a device or bus with an i2c adapter structure, to be used by drivers
+ * to match device-tree nodes with i2c adapters during adapter discovery
+ * callbacks
+ */
+extern int pmac_i2c_match_adapter(struct device_node *dev,
+                                  struct i2c_adapter *adapter);
+
 
-/* Locking functions exposed to i2c-keywest */
-int pmac_low_i2c_lock(struct device_node *np);
-int pmac_low_i2c_unlock(struct device_node *np);
+/* (legacy) Locking functions exposed to i2c-keywest */
+extern int pmac_low_i2c_lock(struct device_node *np);
+extern int pmac_low_i2c_unlock(struct device_node *np);
 
 /* Access functions for platform code */
-int pmac_low_i2c_open(struct device_node *np, int channel);
-int pmac_low_i2c_close(struct device_node *np);
-int pmac_low_i2c_setmode(struct device_node *np, int mode);
-int pmac_low_i2c_xfer(struct device_node *np, u8 addrdir, u8 subaddr, u8 *data, int len);
+extern int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled);
+extern void pmac_i2c_close(struct pmac_i2c_bus *bus);
+extern int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode);
+extern int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
+                         u32 subaddr, u8 *data,  int len);
 
 
 #endif /* __KERNEL__ */