i2c: Add support for device alias names

[linux-2.6-omap-h63xx.git] / drivers / i2c / i2c-core.c

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 6c7fa8d53c0eeaeccfec0366302cdc37717efecb..26384daccb968180c369207e70f35e0a3598e04d 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -48,6 +48,17 @@ static DEFINE_IDR(i2c_adapter_idr);
 
 /* ------------------------------------------------------------------------- */
 
+static const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
+                                               const struct i2c_client *client)
+{
+       while (id->name[0]) {
+               if (strcmp(client->name, id->name) == 0)
+                       return id;
+               id++;
+       }
+       return NULL;
+}
+
 static int i2c_device_match(struct device *dev, struct device_driver *drv)
 {
        struct i2c_client       *client = to_i2c_client(dev);
@@ -59,6 +70,10 @@ static int i2c_device_match(struct device *dev, struct device_driver *drv)
        if (!is_newstyle_driver(driver))
                return 0;
 
+       /* match on an id table if there is one */
+       if (driver->id_table)
+               return i2c_match_id(driver->id_table, client) != NULL;
+
        /* new style drivers use the same kind of driver matching policy
         * as platform devices or SPI:  compare device and driver IDs.
         */
@@ -73,11 +88,17 @@ static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
        struct i2c_client       *client = to_i2c_client(dev);
 
        /* by definition, legacy drivers can't hotplug */
-       if (dev->driver || !client->driver_name)
+       if (dev->driver)
                return 0;
 
-       if (add_uevent_var(env, "MODALIAS=%s", client->driver_name))
-               return -ENOMEM;
+       if (client->driver_name[0]) {
+               if (add_uevent_var(env, "MODALIAS=%s", client->driver_name))
+                       return -ENOMEM;
+       } else {
+               if (add_uevent_var(env, "MODALIAS=%s%s",
+                                  I2C_MODULE_PREFIX, client->name))
+                       return -ENOMEM;
+       }
        dev_dbg(dev, "uevent\n");
        return 0;
 }
@@ -90,13 +111,19 @@ static int i2c_device_probe(struct device *dev)
 {
        struct i2c_client       *client = to_i2c_client(dev);
        struct i2c_driver       *driver = to_i2c_driver(dev->driver);
+       const struct i2c_device_id *id;
        int status;
 
        if (!driver->probe)
                return -ENODEV;
        client->driver = driver;
        dev_dbg(dev, "probe\n");
-       status = driver->probe(client);
+
+       if (driver->id_table)
+               id = i2c_match_id(driver->id_table, client);
+       else
+               id = NULL;
+       status = driver->probe(client, id);
        if (status)
                client->driver = NULL;
        return status;
@@ -179,9 +206,9 @@ static ssize_t show_client_name(struct device *dev, struct device_attribute *att
 static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 {
        struct i2c_client *client = to_i2c_client(dev);
-       return client->driver_name
+       return client->driver_name[0]
                ? sprintf(buf, "%s\n", client->driver_name)
-               : 0;
+               : sprintf(buf, "%s%s\n", I2C_MODULE_PREFIX, client->name);
 }
 
 static struct device_attribute i2c_dev_attrs[] = {
@@ -300,15 +327,21 @@ void i2c_unregister_device(struct i2c_client *client)
 EXPORT_SYMBOL_GPL(i2c_unregister_device);
 
 
-static int dummy_nop(struct i2c_client *client)
+static int dummy_probe(struct i2c_client *client,
+                      const struct i2c_device_id *id)
+{
+       return 0;
+}
+
+static int dummy_remove(struct i2c_client *client)
 {
        return 0;
 }
 
 static struct i2c_driver dummy_driver = {
        .driver.name    = "dummy",
-       .probe          = dummy_nop,
-       .remove         = dummy_nop,
+       .probe          = dummy_probe,
+       .remove         = dummy_remove,
 };
 
 /**