hwmon: (f75375s) Add new style bindings

Following the example of David Brownell's work on lm75:

 - Create a second driver struct, using new-style driver binding methods.

 - Rename the old driver struct as f75375_legacy_driver.

 - Make the legacy bind/unbind logic delegate all its work.

Signed-off-by: Riku Voipio <riku.voipio@movial.fi>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

1 files changed, 83 insertions, 26 deletions

diff --git a/drivers/hwmon/f75375s.c b/drivers/hwmon/f75375s.c
index 59a3470d6cf9..19b3427b5e9e 100644
--- a/drivers/hwmon/f75375s.c
+++ b/drivers/hwmon/f75375s.c
@@ -86,7 +86,7 @@ I2C_CLIENT_INSMOD_2(f75373, f75375);
 
 struct f75375_data {
         unsigned short addr;
-        struct i2c_client client;
+        struct i2c_client *client;
         struct device *hwmon_dev;
 
         const char *name;
@@ -116,15 +116,25 @@ struct f75375_data {
 static int f75375_attach_adapter(struct i2c_adapter *adapter);
 static int f75375_detect(struct i2c_adapter *adapter, int address, int kind);
 static int f75375_detach_client(struct i2c_client *client);
+static int f75375_probe(struct i2c_client *client);
+static int f75375_remove(struct i2c_client *client);
 
-static struct i2c_driver f75375_driver = {
+static struct i2c_driver f75375_legacy_driver = {
         .driver = {
-                .name = "f75375",
+                .name = "f75375_legacy",
         },
         .attach_adapter = f75375_attach_adapter,
         .detach_client = f75375_detach_client,
 };
 
+static struct i2c_driver f75375_driver = {
+        .driver = {
+                .name = "f75375",
+        },
+        .probe = f75375_probe,
+        .remove = f75375_remove,
+};
+
 static inline int f75375_read8(struct i2c_client *client, u8 reg)
 {
         return i2c_smbus_read_byte_data(client, reg);
@@ -580,12 +590,9 @@ static const struct attribute_group f75375_group = {
 
 static int f75375_detach_client(struct i2c_client *client)
 {
-        struct f75375_data *data = i2c_get_clientdata(client);
         int err;
 
-        hwmon_device_unregister(data->hwmon_dev);
-        sysfs_remove_group(&client->dev.kobj, &f75375_group);
-
+        f75375_remove(client);
         err = i2c_detach_client(client);
         if (err) {
                 dev_err(&client->dev,
@@ -593,7 +600,60 @@ static int f75375_detach_client(struct i2c_client *client)
                         "client not detached.\n");
                 return err;
         }
+        kfree(client);
+        return 0;
+}
+
+static int f75375_probe(struct i2c_client *client)
+{
+        struct f75375_data *data = i2c_get_clientdata(client);
+        int err;
+
+        if (!i2c_check_functionality(client->adapter,
+                                I2C_FUNC_SMBUS_BYTE_DATA))
+                return -EIO;
+        if (!(data = kzalloc(sizeof(struct f75375_data), GFP_KERNEL)))
+                return -ENOMEM;
+
+        i2c_set_clientdata(client, data);
+        data->client = client;
+        mutex_init(&data->update_lock);
+
+        if (strcmp(client->name, "f75375") == 0)
+                data->kind = f75375;
+        else if (strcmp(client->name, "f75373") == 0)
+                data->kind = f75373;
+        else {
+                dev_err(&client->dev, "Unsupported device: %s\n", client->name);
+                return -ENODEV;
+        }
+
+        if ((err = sysfs_create_group(&client->dev.kobj, &f75375_group)))
+                goto exit_free;
+
+        data->hwmon_dev = hwmon_device_register(&client->dev);
+        if (IS_ERR(data->hwmon_dev)) {
+                err = PTR_ERR(data->hwmon_dev);
+                goto exit_remove;
+        }
+
+        return 0;
+
+exit_remove:
+        sysfs_remove_group(&client->dev.kobj, &f75375_group);
+exit_free:
+        kfree(data);
+        i2c_set_clientdata(client, NULL);
+        return err;
+}
+
+static int f75375_remove(struct i2c_client *client)
+{
+        struct f75375_data *data = i2c_get_clientdata(client);
+        hwmon_device_unregister(data->hwmon_dev);
+        sysfs_remove_group(&client->dev.kobj, &f75375_group);
         kfree(data);
+        i2c_set_clientdata(client, NULL);
         return 0;
 }
 
@@ -608,20 +668,17 @@ static int f75375_attach_adapter(struct i2c_adapter *adapter)
 static int f75375_detect(struct i2c_adapter *adapter, int address, int kind)
 {
         struct i2c_client *client;
-        struct f75375_data *data;
         u8 version = 0;
         int err = 0;
         const char *name = "";
 
-        if (!(data = kzalloc(sizeof(struct f75375_data), GFP_KERNEL))) {
+        if (!(client = kzalloc(sizeof(*client), GFP_KERNEL))) {
                 err = -ENOMEM;
                 goto exit;
         }
-        client = &data->client;
-        i2c_set_clientdata(client, data);
         client->addr = address;
         client->adapter = adapter;
-        client->driver = &f75375_driver;
+        client->driver = &f75375_legacy_driver;
 
         if (kind < 0) {
                 u16 vendid = f75375_read16(client, F75375_REG_VENDOR);
@@ -644,42 +701,42 @@ static int f75375_detect(struct i2c_adapter *adapter, int address, int kind)
         } else if (kind == f75373) {
                 name = "f75373";
         }
-
         dev_info(&adapter->dev, "found %s version: %02X\n", name, version);
         strlcpy(client->name, name, I2C_NAME_SIZE);
-        data->kind = kind;
-        mutex_init(&data->update_lock);
+
         if ((err = i2c_attach_client(client)))
                 goto exit_free;
 
-        if ((err = sysfs_create_group(&client->dev.kobj, &f75375_group)))
+        if ((err = f75375_probe(client)) < 0)
                 goto exit_detach;
 
-        data->hwmon_dev = hwmon_device_register(&client->dev);
-        if (IS_ERR(data->hwmon_dev)) {
-                err = PTR_ERR(data->hwmon_dev);
-                goto exit_remove;
-        }
-
         return 0;
 
-exit_remove:
-        sysfs_remove_group(&client->dev.kobj, &f75375_group);
 exit_detach:
         i2c_detach_client(client);
 exit_free:
-        kfree(data);
+        kfree(client);
 exit:
         return err;
 }
 
 static int __init sensors_f75375_init(void)
 {
-        return i2c_add_driver(&f75375_driver);
+        int status;
+        status = i2c_add_driver(&f75375_driver);
+        if (status)
+                return status;
+
+        status = i2c_add_driver(&f75375_legacy_driver);
+        if (status)
+                i2c_del_driver(&f75375_driver);
+
+        return status;
 }
 
 static void __exit sensors_f75375_exit(void)
 {
+        i2c_del_driver(&f75375_legacy_driver);
         i2c_del_driver(&f75375_driver);
 }