hwmon: (ads7828) Convert to a new-style i2c driver

The new-style ads7828 driver implements the optional detect() callback
to cover the use cases of the legacy driver.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/hwmon/ads7828.c b/drivers/hwmon/ads7828.c
index 5c8b6e0ff47c21354592d6ddcb63f5ebe48db5db..5c39b4af1b236723c96e9f4fd7ec19d6834d280d 100644 (file)
--- a/drivers/hwmon/ads7828.c
+++ b/drivers/hwmon/ads7828.c
@@ -64,7 +64,6 @@ static unsigned int ads7828_lsb_resol; /* resolution of the ADC sample lsb */
 
 /* Each client has this additional data */
 struct ads7828_data {
-       struct i2c_client client;
        struct device *hwmon_dev;
        struct mutex update_lock; /* mutex protect updates */
        char valid; /* !=0 if following fields are valid */
@@ -73,7 +72,10 @@ struct ads7828_data {
 };
 
 /* Function declaration - necessary due to function dependencies */
-static int ads7828_detect(struct i2c_adapter *adapter, int address, int kind);
+static int ads7828_detect(struct i2c_client *client, int kind,
+                         struct i2c_board_info *info);
+static int ads7828_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id);
 
 /* The ADS7828 returns the 12-bit sample in two bytes,
        these are read as a word then byte-swapped */
@@ -156,58 +158,43 @@ static const struct attribute_group ads7828_group = {
        .attrs = ads7828_attributes,
 };
 
-static int ads7828_attach_adapter(struct i2c_adapter *adapter)
-{
-       if (!(adapter->class & I2C_CLASS_HWMON))
-               return 0;
-       return i2c_probe(adapter, &addr_data, ads7828_detect);
-}
-
-static int ads7828_detach_client(struct i2c_client *client)
+static int ads7828_remove(struct i2c_client *client)
 {
        struct ads7828_data *data = i2c_get_clientdata(client);
        hwmon_device_unregister(data->hwmon_dev);
        sysfs_remove_group(&client->dev.kobj, &ads7828_group);
-       i2c_detach_client(client);
        kfree(i2c_get_clientdata(client));
        return 0;
 }
 
+static const struct i2c_device_id ads7828_id[] = {
+       { "ads7828", ads7828 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, ads7828_id);
+
 /* This is the driver that will be inserted */
 static struct i2c_driver ads7828_driver = {
+       .class = I2C_CLASS_HWMON,
        .driver = {
                .name = "ads7828",
        },
-       .attach_adapter = ads7828_attach_adapter,
-       .detach_client = ads7828_detach_client,
+       .probe = ads7828_probe,
+       .remove = ads7828_remove,
+       .id_table = ads7828_id,
+       .detect = ads7828_detect,
+       .address_data = &addr_data,
 };
 
-/* This function is called by i2c_probe */
-static int ads7828_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int ads7828_detect(struct i2c_client *client, int kind,
+                         struct i2c_board_info *info)
 {
-       struct i2c_client *client;
-       struct ads7828_data *data;
-       int err = 0;
-       const char *name = "";
+       struct i2c_adapter *adapter = client->adapter;
 
        /* Check we have a valid client */
        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_WORD_DATA))
-               goto exit;
-
-       /* 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 ads7828_read_value. */
-       data = kzalloc(sizeof(struct ads7828_data), GFP_KERNEL);
-       if (!data) {
-               err = -ENOMEM;
-               goto exit;
-       }
-
-       client = &data->client;
-       i2c_set_clientdata(client, data);
-       client->addr = address;
-       client->adapter = adapter;
-       client->driver = &ads7828_driver;
+               return -ENODEV;
 
        /* Now, we do the remaining detection. There is no identification
        dedicated register so attempt to sanity check using knowledge of
@@ -225,32 +212,34 @@ static int ads7828_detect(struct i2c_adapter *adapter, int address, int kind)
                                printk(KERN_DEBUG
                                "%s : Doesn't look like an ads7828 device\n",
                                __func__);
-                               goto exit_free;
+                               return -ENODEV;
                        }
                }
        }
+       strlcpy(info->type, "ads7828", I2C_NAME_SIZE);
 
-       /* Determine the chip type - only one kind supported! */
-       if (kind <= 0)
-               kind = ads7828;
+       return 0;
+}
 
-       if (kind == ads7828)
-               name = "ads7828";
+static int ads7828_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       struct ads7828_data *data;
+       int err;
 
-       /* Fill in the remaining client fields, put it into the global list */
-       strlcpy(client->name, name, I2C_NAME_SIZE);
+       data = kzalloc(sizeof(struct ads7828_data), GFP_KERNEL);
+       if (!data) {
+               err = -ENOMEM;
+               goto exit;
+       }
 
+       i2c_set_clientdata(client, data);
        mutex_init(&data->update_lock);
 
-       /* Tell the I2C layer a new client has arrived */
-       err = i2c_attach_client(client);
-       if (err)
-               goto exit_free;
-
        /* Register sysfs hooks */
        err = sysfs_create_group(&client->dev.kobj, &ads7828_group);
        if (err)
-               goto exit_detach;
+               goto exit_free;
 
        data->hwmon_dev = hwmon_device_register(&client->dev);
        if (IS_ERR(data->hwmon_dev)) {
@@ -262,8 +251,6 @@ static int ads7828_detect(struct i2c_adapter *adapter, int address, int kind)
 
 exit_remove:
        sysfs_remove_group(&client->dev.kobj, &ads7828_group);
-exit_detach:
-       i2c_detach_client(client);
 exit_free:
        kfree(data);
 exit: