[PATCH] 2/5 powerpc: Rework PowerMac i2c part 2

This is the continuation of the previous patch. This one removes the old
PowerMac i2c drivers (i2c-keywest and i2c-pmac-smu) and replaces them
both with a single stub driver that uses the new PowerMac low i2c layer.

Now that i2c-keywest is gone, the low-i2c code is extended to support
interrupt driver transfers. All i2c busses now appear as platform
devices. Compatibility with existing drivers should be maintained as the
i2c bus names have been kept identical, except for the SMU bus but in
that later case, all users has been fixed.

With that patch added, matching a device node to an i2c_adapter becomes
trivial.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 8 insertions, 42 deletions

diff --git a/drivers/macintosh/windfarm_lm75_sensor.c b/drivers/macintosh/windfarm_lm75_sensor.c
index 57460e46c89..906d3ecae6e 100644
--- a/drivers/macintosh/windfarm_lm75_sensor.c
+++ b/drivers/macintosh/windfarm_lm75_sensor.c
@@ -21,6 +21,7 @@
 #include <asm/io.h>
 #include <asm/system.h>
 #include <asm/sections.h>
+#include <asm/pmac_low_i2c.h>
 
 #include "windfarm.h"
 
@@ -157,53 +158,21 @@ static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter,
 
 static int wf_lm75_attach(struct i2c_adapter *adapter)
 {
-	u8 bus_id;
-	struct device_node *smu, *bus, *dev;
-
-	/* We currently only deal with LM75's hanging off the SMU
-	 * i2c busses. If we extend that driver to other/older
-	 * machines, we should split this function into SMU-i2c,
-	 * keywest-i2c, PMU-i2c, ...
-	 */
+	struct device_node *busnode, *dev;
+	struct pmac_i2c_bus *bus;
 
 	DBG("wf_lm75: adapter %s detected\n", adapter->name);
 
-	if (strncmp(adapter->name, "smu-i2c-", 8) != 0)
-		return 0;
-	smu = of_find_node_by_type(NULL, "smu");
-	if (smu == NULL)
-		return 0;
-
-	/* Look for the bus in the device-tree */
-	bus_id = (u8)simple_strtoul(adapter->name + 8, NULL, 16);
-
-	DBG("wf_lm75: bus ID is %x\n", bus_id);
-
-	/* Look for sensors subdir */
-	for (bus = NULL;
-	     (bus = of_get_next_child(smu, bus)) != NULL;) {
-		u32 *reg;
-
-		if (strcmp(bus->name, "i2c"))
-			continue;
-		reg = (u32 *)get_property(bus, "reg", NULL);
-		if (reg == NULL)
-			continue;
-		if (bus_id == *reg)
-			break;
-	}
-	of_node_put(smu);
-	if (bus == NULL) {
-		printk(KERN_WARNING "windfarm: SMU i2c bus 0x%x not found"
-		       " in device-tree !\n", bus_id);
-		return 0;
-	}
+	bus = pmac_i2c_adapter_to_bus(adapter);
+	if (bus == NULL)
+		return -ENODEV;
+	busnode = pmac_i2c_get_bus_node(bus);
 
 	DBG("wf_lm75: bus found, looking for device...\n");
 
 	/* Now look for lm75(s) in there */
 	for (dev = NULL;
-	     (dev = of_get_next_child(bus, dev)) != NULL;) {
+	     (dev = of_get_next_child(busnode, dev)) != NULL;) {
 		const char *loc =
 			get_property(dev, "hwsensor-location", NULL);
 		u32 *reg = (u32 *)get_property(dev, "reg", NULL);
@@ -217,9 +186,6 @@ static int wf_lm75_attach(struct i2c_adapter *adapter)
 		else if (device_is_compatible(dev, "ds1775"))
 			wf_lm75_create(adapter, *reg, 1, loc);
 	}
-
-	of_node_put(bus);
-
 	return 0;
 }