I2C: Put I2C devices on their own bus

This patch adds a I2C bus on which the I2C devices and drivers register.
This makes it cleaner as I2C devices won't accidently end up probed by
a platform_device driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/i2c/i2c.c

@@ -251,6 +251,7 @@ struct i2c_client *i2c_new_device(struct i2c_adapter *adapter,
 	strcpy(client->dev.name, chip->type);
 	client->dev.type_data = client;
 	client->dev.platform_data = chip->platform_data;
+	client->dev.bus = &i2c_bus;
 	client->adapter = adapter;
 	client->addr = chip->addr;
 
@@ -372,3 +373,25 @@ int i2c_add_numbered_adapter(struct i2c_adapter *adapter)
 	return 0;
 }
 EXPORT_SYMBOL(i2c_add_numbered_adapter);
+
+static int i2c_match(struct device_d *dev, struct driver_d *drv)
+{
+	return strcmp(dev->name, drv->name) ? -1 : 0;
+}
+
+static int i2c_probe(struct device_d *dev)
+{
+	return dev->driver->probe(dev);
+}
+
+static void i2c_remove(struct device_d *dev)
+{
+	dev->driver->remove(dev);
+}
+
+struct bus_type i2c_bus = {
+	.name = "i2c",
+	.match = i2c_match,
+	.probe = i2c_probe,
+	.remove = i2c_remove,
+};

drivers/mfd/lp3972.c

@@ -103,7 +103,7 @@ static struct driver_d lp_driver = {
 
 static int lp_init(void)
 {
-	register_driver(&lp_driver);
+	i2c_register_driver(&lp_driver);
 	return 0;
 }
 

drivers/mfd/mc13xxx.c

@@ -349,7 +349,7 @@ static struct driver_d mc_i2c_driver = {
 
 static int mc_i2c_init(void)
 {
-	return register_driver(&mc_i2c_driver);
+	return i2c_register_driver(&mc_i2c_driver);
 }
 device_initcall(mc_i2c_init);
 #endif

drivers/mfd/mc34704.c

@@ -134,7 +134,7 @@ static struct driver_d mc34704_driver = {
 
 static int mc34704_init(void)
 {
-	register_driver(&mc34704_driver);
-        return 0;
+	i2c_register_driver(&mc34704_driver);
+	return 0;
 }
 device_initcall(mc34704_init);

drivers/mfd/mc34708.c

@@ -279,7 +279,7 @@ static struct driver_d mc_i2c_driver = {
 
 static int mc_i2c_init(void)
 {
-	return register_driver(&mc_i2c_driver);
+	return i2c_register_driver(&mc_i2c_driver);
 }
 
 device_initcall(mc_i2c_init);

drivers/mfd/mc9sdz60.c

@@ -146,7 +146,7 @@ static struct driver_d mc_driver = {
 
 static int mc_init(void)
 {
-        register_driver(&mc_driver);
+        i2c_register_driver(&mc_driver);
         return 0;
 }
 

drivers/mfd/stmpe-i2c.c

@@ -146,7 +146,7 @@ static struct driver_d stmpe_driver = {
 
 static int stmpe_init(void)
 {
-        register_driver(&stmpe_driver);
+        i2c_register_driver(&stmpe_driver);
         return 0;
 }
 

drivers/mfd/twl4030.c

@@ -53,7 +53,7 @@ static struct driver_d twl_driver = {
 
 static int twl_init(void)
 {
-	register_driver(&twl_driver);
+	i2c_register_driver(&twl_driver);
 	return 0;
 }
 

drivers/mfd/twl6030.c

@@ -49,7 +49,7 @@ static struct driver_d twl_driver = {
 
 static int twl_init(void)
 {
-	register_driver(&twl_driver);
+	i2c_register_driver(&twl_driver);
 	return 0;
 }
 

include/i2c/i2c.h

@@ -139,4 +139,12 @@ extern int i2c_write_reg(struct i2c_client *client, u32 addr, const u8 *buf, u16
 
 #endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
+extern struct bus_type i2c_bus;
+
+static inline int i2c_register_driver(struct driver_d *drv)
+{
+	drv->bus = &i2c_bus;
+	return register_driver(drv);
+}
+
 #endif /* I2C_I2C_H */