hwmon: (lm93) Convert to a new-style i2c driver

The new-style lm93 driver implements the optional detect() callback
to cover the use cases of the legacy driver.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Mark M. Hoffman <mhoffman@lightlink.com>
Cc: Eric J. Bowersox <ericb@aspsys.com>
Cc: Carsten Emde <cbe@osadl.org>
Cc: Hans J. Koch <hjk@linutronix.de>

1 files changed, 60 insertions, 66 deletions

diff --git a/drivers/hwmon/lm93.c b/drivers/hwmon/lm93.c
index 5e678f5c883d..fc36cadf36fb 100644
--- a/drivers/hwmon/lm93.c
+++ b/drivers/hwmon/lm93.c
@@ -200,7 +200,6 @@ struct block1_t {
  * Client-specific data
  */
 struct lm93_data {
-        struct i2c_client client;
         struct device *hwmon_dev;
 
         struct mutex update_lock;
@@ -2501,45 +2500,14 @@ static void lm93_init_client(struct i2c_client *client)
                  "chip to signal ready!\n");
 }
 
-static int lm93_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm93_detect(struct i2c_client *client, int kind,
+                       struct i2c_board_info *info)
 {
-        struct lm93_data *data;
-        struct i2c_client *client;
-
-        int err = -ENODEV, func;
-        void (*update)(struct lm93_data *, struct i2c_client *);
-
-        /* choose update routine based on bus capabilities */
-        func = i2c_get_functionality(adapter);
-        if ( ((LM93_SMBUS_FUNC_FULL & func) == LM93_SMBUS_FUNC_FULL) &&
-                        (!disable_block) ) {
-                dev_dbg(&adapter->dev,"using SMBus block data transactions\n");
-                update = lm93_update_client_full;
-        } else if ((LM93_SMBUS_FUNC_MIN & func) == LM93_SMBUS_FUNC_MIN) {
-                dev_dbg(&adapter->dev,"disabled SMBus block data "
-                        "transactions\n");
-                update = lm93_update_client_min;
-        } else {
-                dev_dbg(&adapter->dev,"detect failed, "
-                        "smbus byte and/or word data not supported!\n");
-                goto err_out;
-        }
+        struct i2c_adapter *adapter = client->adapter;
 
-        /* OK. For now, we presume we have a valid client. We now create the
-           client structure, even though we cannot fill it completely yet.
-           But it allows us to access lm78_{read,write}_value. */
-
-        if ( !(data = kzalloc(sizeof(struct lm93_data), GFP_KERNEL))) {
-                dev_dbg(&adapter->dev,"out of memory!\n");
-                err = -ENOMEM;
-                goto err_out;
-        }
-
-        client = &data->client;
-        i2c_set_clientdata(client, data);
-        client->addr = address;
-        client->adapter = adapter;
-        client->driver = &lm93_driver;
+        if (!i2c_check_functionality(adapter, LM93_SMBUS_FUNC_MIN))
+                return -ENODEV;
 
         /* detection */
         if (kind < 0) {
@@ -2548,7 +2516,7 @@ static int lm93_detect(struct i2c_adapter *adapter, int address, int kind)
                 if (mfr != 0x01) {
                         dev_dbg(&adapter->dev,"detect failed, "
                                 "bad manufacturer id 0x%02x!\n", mfr);
-                        goto err_free;
+                        return -ENODEV;
                 }
         }
 
@@ -2563,31 +2531,61 @@ static int lm93_detect(struct i2c_adapter *adapter, int address, int kind)
                         if (kind == 0)
                                 dev_dbg(&adapter->dev,
                                         "(ignored 'force' parameter)\n");
-                        goto err_free;
+                        return -ENODEV;
                 }
         }
 
-        /* fill in remaining client fields */
-        strlcpy(client->name, "lm93", I2C_NAME_SIZE);
+        strlcpy(info->type, "lm93", I2C_NAME_SIZE);
         dev_dbg(&adapter->dev,"loading %s at %d,0x%02x\n",
                 client->name, i2c_adapter_id(client->adapter),
                 client->addr);
 
+        return 0;
+}
+
+static int lm93_probe(struct i2c_client *client,
+                      const struct i2c_device_id *id)
+{
+        struct lm93_data *data;
+        int err, func;
+        void (*update)(struct lm93_data *, struct i2c_client *);
+
+        /* choose update routine based on bus capabilities */
+        func = i2c_get_functionality(client->adapter);
+        if (((LM93_SMBUS_FUNC_FULL & func) == LM93_SMBUS_FUNC_FULL) &&
+                        (!disable_block)) {
+                dev_dbg(&client->dev, "using SMBus block data transactions\n");
+                update = lm93_update_client_full;
+        } else if ((LM93_SMBUS_FUNC_MIN & func) == LM93_SMBUS_FUNC_MIN) {
+                dev_dbg(&client->dev, "disabled SMBus block data "
+                        "transactions\n");
+                update = lm93_update_client_min;
+        } else {
+                dev_dbg(&client->dev, "detect failed, "
+                        "smbus byte and/or word data not supported!\n");
+                err = -ENODEV;
+                goto err_out;
+        }
+
+        data = kzalloc(sizeof(struct lm93_data), GFP_KERNEL);
+        if (!data) {
+                dev_dbg(&client->dev, "out of memory!\n");
+                err = -ENOMEM;
+                goto err_out;
+        }
+        i2c_set_clientdata(client, data);
+
         /* housekeeping */
         data->valid = 0;
         data->update = update;
         mutex_init(&data->update_lock);
 
-        /* tell the I2C layer a new client has arrived */
-        if ((err = i2c_attach_client(client)))
-                goto err_free;
-
         /* initialize the chip */
         lm93_init_client(client);
 
         err = sysfs_create_group(&client->dev.kobj, &lm93_attr_grp);
         if (err)
-                goto err_detach;
+                goto err_free;
 
         /* Register hwmon driver class */
         data->hwmon_dev = hwmon_device_register(&client->dev);
@@ -2597,43 +2595,39 @@ static int lm93_detect(struct i2c_adapter *adapter, int address, int kind)
         err = PTR_ERR(data->hwmon_dev);
         dev_err(&client->dev, "error registering hwmon device.\n");
         sysfs_remove_group(&client->dev.kobj, &lm93_attr_grp);
-err_detach:
-        i2c_detach_client(client);
 err_free:
         kfree(data);
 err_out:
         return err;
 }
 
-/* This function is called when:
-     * lm93_driver is inserted (when this module is loaded), for each
-       available adapter
-     * when a new adapter is inserted (and lm93_driver is still present) */
-static int lm93_attach_adapter(struct i2c_adapter *adapter)
-{
-        return i2c_probe(adapter, &addr_data, lm93_detect);
-}
-
-static int lm93_detach_client(struct i2c_client *client)
+static int lm93_remove(struct i2c_client *client)
 {
         struct lm93_data *data = i2c_get_clientdata(client);
-        int err = 0;
 
         hwmon_device_unregister(data->hwmon_dev);
         sysfs_remove_group(&client->dev.kobj, &lm93_attr_grp);
 
-        err = i2c_detach_client(client);
-        if (!err)
-                kfree(data);
-        return err;
+        kfree(data);
+        return 0;
 }
 
+static const struct i2c_device_id lm93_id[] = {
+        { "lm93", lm93 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, lm93_id);
+
 static struct i2c_driver lm93_driver = {
+        .class          = I2C_CLASS_HWMON,
         .driver = {
                 .name   = "lm93",
         },
-        .attach_adapter = lm93_attach_adapter,
-        .detach_client  = lm93_detach_client,
+        .probe          = lm93_probe,
+        .remove         = lm93_remove,
+        .id_table       = lm93_id,
+        .detect         = lm93_detect,
+        .address_data   = &addr_data,
 };
 
 static int __init lm93_init(void)