hwmon: (adt7470) Convert to a new-style i2c driver

The new-style adt7470 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: Darrick J. Wong <djwong@us.ibm.com>

1 files changed, 48 insertions, 52 deletions

diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c
index 6b5325f33a2c..d368d8f845e1 100644
--- a/drivers/hwmon/adt7470.c
+++ b/drivers/hwmon/adt7470.c
@@ -138,7 +138,6 @@ I2C_CLIENT_INSMOD_1(adt7470);
 #define FAN_DATA_VALID(x)       ((x) && (x) != FAN_PERIOD_INVALID)
 
 struct adt7470_data {
-        struct i2c_client       client;
         struct device           *hwmon_dev;
         struct attribute_group  attrs;
         struct mutex            lock;
@@ -164,16 +163,28 @@ struct adt7470_data {
         u8                      pwm_auto_temp[ADT7470_PWM_COUNT];
 };
 
-static int adt7470_attach_adapter(struct i2c_adapter *adapter);
-static int adt7470_detect(struct i2c_adapter *adapter, int address, int kind);
-static int adt7470_detach_client(struct i2c_client *client);
+static int adt7470_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id);
+static int adt7470_detect(struct i2c_client *client, int kind,
+                          struct i2c_board_info *info);
+static int adt7470_remove(struct i2c_client *client);
+
+static const struct i2c_device_id adt7470_id[] = {
+        { "adt7470", adt7470 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, adt7470_id);
 
 static struct i2c_driver adt7470_driver = {
+        .class          = I2C_CLASS_HWMON,
         .driver = {
                 .name   = "adt7470",
         },
-        .attach_adapter = adt7470_attach_adapter,
-        .detach_client  = adt7470_detach_client,
+        .probe          = adt7470_probe,
+        .remove         = adt7470_remove,
+        .id_table       = adt7470_id,
+        .detect         = adt7470_detect,
+        .address_data   = &addr_data,
 };
 
 /*
@@ -1004,64 +1015,52 @@ static struct attribute *adt7470_attr[] =
         NULL
 };
 
-static int adt7470_attach_adapter(struct i2c_adapter *adapter)
-{
-        if (!(adapter->class & I2C_CLASS_HWMON))
-                return 0;
-        return i2c_probe(adapter, &addr_data, adt7470_detect);
-}
-
-static int adt7470_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int adt7470_detect(struct i2c_client *client, int kind,
+                          struct i2c_board_info *info)
 {
-        struct i2c_client *client;
-        struct adt7470_data *data;
-        int err = 0;
+        struct i2c_adapter *adapter = client->adapter;
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-                goto exit;
-
-        if (!(data = kzalloc(sizeof(struct adt7470_data), GFP_KERNEL))) {
-                err = -ENOMEM;
-                goto exit;
-        }
-
-        client = &data->client;
-        client->addr = address;
-        client->adapter = adapter;
-        client->driver = &adt7470_driver;
-
-        i2c_set_clientdata(client, data);
-
-        mutex_init(&data->lock);
+                return -ENODEV;
 
         if (kind <= 0) {
                 int vendor, device, revision;
 
                 vendor = i2c_smbus_read_byte_data(client, ADT7470_REG_VENDOR);
-                if (vendor != ADT7470_VENDOR) {
-                        err = -ENODEV;
-                        goto exit_free;
-                }
+                if (vendor != ADT7470_VENDOR)
+                        return -ENODEV;
 
                 device = i2c_smbus_read_byte_data(client, ADT7470_REG_DEVICE);
-                if (device != ADT7470_DEVICE) {
-                        err = -ENODEV;
-                        goto exit_free;
-                }
+                if (device != ADT7470_DEVICE)
+                        return -ENODEV;
 
                 revision = i2c_smbus_read_byte_data(client,
                                                     ADT7470_REG_REVISION);
-                if (revision != ADT7470_REVISION) {
-                        err = -ENODEV;
-                        goto exit_free;
-                }
+                if (revision != ADT7470_REVISION)
+                        return -ENODEV;
         } else
                 dev_dbg(&adapter->dev, "detection forced\n");
 
-        strlcpy(client->name, "adt7470", I2C_NAME_SIZE);
+        strlcpy(info->type, "adt7470", I2C_NAME_SIZE);
 
-        if ((err = i2c_attach_client(client)))
-                goto exit_free;
+        return 0;
+}
+
+static int adt7470_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id)
+{
+        struct adt7470_data *data;
+        int err;
+
+        data = kzalloc(sizeof(struct adt7470_data), GFP_KERNEL);
+        if (!data) {
+                err = -ENOMEM;
+                goto exit;
+        }
+
+        i2c_set_clientdata(client, data);
+        mutex_init(&data->lock);
 
         dev_info(&client->dev, "%s chip found\n", client->name);
 
@@ -1071,7 +1070,7 @@ static int adt7470_detect(struct i2c_adapter *adapter, int address, int kind)
         /* Register sysfs hooks */
         data->attrs.attrs = adt7470_attr;
         if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs)))
-                goto exit_detach;
+                goto exit_free;
 
         data->hwmon_dev = hwmon_device_register(&client->dev);
         if (IS_ERR(data->hwmon_dev)) {
@@ -1083,21 +1082,18 @@ static int adt7470_detect(struct i2c_adapter *adapter, int address, int kind)
 
 exit_remove:
         sysfs_remove_group(&client->dev.kobj, &data->attrs);
-exit_detach:
-        i2c_detach_client(client);
 exit_free:
         kfree(data);
 exit:
         return err;
 }
 
-static int adt7470_detach_client(struct i2c_client *client)
+static int adt7470_remove(struct i2c_client *client)
 {
         struct adt7470_data *data = i2c_get_clientdata(client);
 
         hwmon_device_unregister(data->hwmon_dev);
         sysfs_remove_group(&client->dev.kobj, &data->attrs);
-        i2c_detach_client(client);
         kfree(data);
         return 0;
 }