hwmon: (adm9240) Convert to a new-style i2c driver

The new-style adm9240 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: Grant Coady <gcoady.lk@gmail.com>

1 files changed, 46 insertions, 47 deletions

diff --git a/drivers/hwmon/adm9240.c b/drivers/hwmon/adm9240.c
index 149ef25252e7..2444b15f2e9d 100644
--- a/drivers/hwmon/adm9240.c
+++ b/drivers/hwmon/adm9240.c
@@ -130,25 +130,37 @@ static inline unsigned int AOUT_FROM_REG(u8 reg)
         return SCALE(reg, 1250, 255);
 }
 
-static int adm9240_attach_adapter(struct i2c_adapter *adapter);
-static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind);
+static int adm9240_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id);
+static int adm9240_detect(struct i2c_client *client, int kind,
+                          struct i2c_board_info *info);
 static void adm9240_init_client(struct i2c_client *client);
-static int adm9240_detach_client(struct i2c_client *client);
+static int adm9240_remove(struct i2c_client *client);
 static struct adm9240_data *adm9240_update_device(struct device *dev);
 
 /* driver data */
+static const struct i2c_device_id adm9240_id[] = {
+        { "adm9240", adm9240 },
+        { "ds1780", ds1780 },
+        { "lm81", lm81 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, adm9240_id);
+
 static struct i2c_driver adm9240_driver = {
+        .class          = I2C_CLASS_HWMON,
         .driver = {
                 .name   = "adm9240",
         },
-        .attach_adapter = adm9240_attach_adapter,
-        .detach_client  = adm9240_detach_client,
+        .probe          = adm9240_probe,
+        .remove         = adm9240_remove,
+        .id_table       = adm9240_id,
+        .detect         = adm9240_detect,
+        .address_data   = &addr_data,
 };
 
 /* per client data */
 struct adm9240_data {
-        enum chips type;
-        struct i2c_client client;
         struct device *hwmon_dev;
         struct mutex update_lock;
         char valid;
@@ -532,28 +544,17 @@ static const struct attribute_group adm9240_group = {
 
 /*** sensor chip detect and driver install ***/
 
-static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int adm9240_detect(struct i2c_client *new_client, int kind,
+                          struct i2c_board_info *info)
 {
-        struct i2c_client *new_client;
-        struct adm9240_data *data;
-        int err = 0;
+        struct i2c_adapter *adapter = new_client->adapter;
         const char *name = "";
+        int address = new_client->addr;
         u8 man_id, die_rev;
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-                goto exit;
-
-        if (!(data = kzalloc(sizeof(*data), GFP_KERNEL))) {
-                err = -ENOMEM;
-                goto exit;
-        }
-
-        new_client = &data->client;
-        i2c_set_clientdata(new_client, data);
-        new_client->addr = address;
-        new_client->adapter = adapter;
-        new_client->driver = &adm9240_driver;
-        new_client->flags = 0;
+                return -ENODEV;
 
         if (kind == 0) {
                 kind = adm9240;
@@ -566,7 +567,7 @@ static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
                                 != address) {
                         dev_err(&adapter->dev, "detect fail: address match, "
                                         "0x%02x\n", address);
-                        goto exit_free;
+                        return -ENODEV;
                 }
 
                 /* check known chip manufacturer */
@@ -581,7 +582,7 @@ static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
                 } else {
                         dev_err(&adapter->dev, "detect fail: unknown manuf, "
                                         "0x%02x\n", man_id);
-                        goto exit_free;
+                        return -ENODEV;
                 }
 
                 /* successful detect, print chip info */
@@ -600,20 +601,31 @@ static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
         } else if (kind == lm81) {
                 name = "lm81";
         }
+        strlcpy(info->type, name, I2C_NAME_SIZE);
 
-        /* fill in the remaining client fields and attach */
-        strlcpy(new_client->name, name, I2C_NAME_SIZE);
-        data->type = kind;
-        mutex_init(&data->update_lock);
+        return 0;
+}
 
-        if ((err = i2c_attach_client(new_client)))
-                goto exit_free;
+static int adm9240_probe(struct i2c_client *new_client,
+                         const struct i2c_device_id *id)
+{
+        struct adm9240_data *data;
+        int err;
+
+        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        if (!data) {
+                err = -ENOMEM;
+                goto exit;
+        }
+
+        i2c_set_clientdata(new_client, data);
+        mutex_init(&data->update_lock);
 
         adm9240_init_client(new_client);
 
         /* populate sysfs filesystem */
         if ((err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group)))
-                goto exit_detach;
+                goto exit_free;
 
         data->hwmon_dev = hwmon_device_register(&new_client->dev);
         if (IS_ERR(data->hwmon_dev)) {
@@ -625,32 +637,19 @@ static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
 
 exit_remove:
         sysfs_remove_group(&new_client->dev.kobj, &adm9240_group);
-exit_detach:
-        i2c_detach_client(new_client);
 exit_free:
         kfree(data);
 exit:
         return err;
 }
 
-static int adm9240_attach_adapter(struct i2c_adapter *adapter)
-{
-        if (!(adapter->class & I2C_CLASS_HWMON))
-                return 0;
-        return i2c_probe(adapter, &addr_data, adm9240_detect);
-}
-
-static int adm9240_detach_client(struct i2c_client *client)
+static int adm9240_remove(struct i2c_client *client)
 {
         struct adm9240_data *data = i2c_get_clientdata(client);
-        int err;
 
         hwmon_device_unregister(data->hwmon_dev);
         sysfs_remove_group(&client->dev.kobj, &adm9240_group);
 
-        if ((err = i2c_detach_client(client)))
-                return err;
-
         kfree(data);
         return 0;
 }