hwmon: (lm83) Convert to a new-style i2c driver
Jean Delvare [Wed, 16 Jul 2008 17:30:14 +0000 (19:30 +0200)]
The new-style lm83 driver implements the optional detect() callback
to cover the use cases of the legacy driver.

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

drivers/hwmon/lm83.c

index 6a8642f..e59e2d1 100644 (file)
@@ -1,7 +1,7 @@
 /*
  * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
  *          monitoring
- * Copyright (C) 2003-2006  Jean Delvare <khali@linux-fr.org>
+ * Copyright (C) 2003-2008  Jean Delvare <khali@linux-fr.org>
  *
  * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
  * a sensor chip made by National Semiconductor. It reports up to four
@@ -118,21 +118,34 @@ static const u8 LM83_REG_W_HIGH[] = {
  * Functions declaration
  */
 
-static int lm83_attach_adapter(struct i2c_adapter *adapter);
-static int lm83_detect(struct i2c_adapter *adapter, int address, int kind);
-static int lm83_detach_client(struct i2c_client *client);
+static int lm83_detect(struct i2c_client *new_client, int kind,
+                      struct i2c_board_info *info);
+static int lm83_probe(struct i2c_client *client,
+                     const struct i2c_device_id *id);
+static int lm83_remove(struct i2c_client *client);
 static struct lm83_data *lm83_update_device(struct device *dev);
 
 /*
  * Driver data (common to all clients)
  */
  
+static const struct i2c_device_id lm83_id[] = {
+       { "lm83", lm83 },
+       { "lm82", lm82 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, lm83_id);
+
 static struct i2c_driver lm83_driver = {
+       .class          = I2C_CLASS_HWMON,
        .driver = {
                .name   = "lm83",
        },
-       .attach_adapter = lm83_attach_adapter,
-       .detach_client  = lm83_detach_client,
+       .probe          = lm83_probe,
+       .remove         = lm83_remove,
+       .id_table       = lm83_id,
+       .detect         = lm83_detect,
+       .address_data   = &addr_data,
 };
 
 /*
@@ -140,7 +153,6 @@ static struct i2c_driver lm83_driver = {
  */
 
 struct lm83_data {
-       struct i2c_client client;
        struct device *hwmon_dev;
        struct mutex update_lock;
        char valid; /* zero until following fields are valid */
@@ -278,40 +290,15 @@ static const struct attribute_group lm83_group_opt = {
  * Real code
  */
 
-static int lm83_attach_adapter(struct i2c_adapter *adapter)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm83_detect(struct i2c_client *new_client, int kind,
+                      struct i2c_board_info *info)
 {
-       if (!(adapter->class & I2C_CLASS_HWMON))
-               return 0;
-       return i2c_probe(adapter, &addr_data, lm83_detect);
-}
-
-/*
- * The following function does more than just detection. If detection
- * succeeds, it also registers the new chip.
- */
-static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
-{
-       struct i2c_client *new_client;
-       struct lm83_data *data;
-       int err = 0;
+       struct i2c_adapter *adapter = new_client->adapter;
        const char *name = "";
 
        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-               goto exit;
-
-       if (!(data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL))) {
-               err = -ENOMEM;
-               goto exit;
-       }
-
-       /* The common I2C client data is placed right after the
-        * LM83-specific data. */
-       new_client = &data->client;
-       i2c_set_clientdata(new_client, data);
-       new_client->addr = address;
-       new_client->adapter = adapter;
-       new_client->driver = &lm83_driver;
-       new_client->flags = 0;
+               return -ENODEV;
 
        /* Now we do the detection and identification. A negative kind
         * means that the driver was loaded with no force parameter
@@ -335,8 +322,9 @@ static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
                    ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
                    & 0x41) != 0x00)) {
                        dev_dbg(&adapter->dev,
-                           "LM83 detection failed at 0x%02x.\n", address);
-                       goto exit_free;
+                               "LM83 detection failed at 0x%02x.\n",
+                               new_client->addr);
+                       return -ENODEV;
                }
        }
 
@@ -361,7 +349,7 @@ static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
                        dev_info(&adapter->dev,
                            "Unsupported chip (man_id=0x%02X, "
                            "chip_id=0x%02X).\n", man_id, chip_id);
-                       goto exit_free;
+                       return -ENODEV;
                }
        }
 
@@ -372,15 +360,27 @@ static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
                name = "lm82";
        }
 
-       /* We can fill in the remaining client fields */
-       strlcpy(new_client->name, name, I2C_NAME_SIZE);
+       strlcpy(info->type, name, I2C_NAME_SIZE);
+
+       return 0;
+}
+
+static int lm83_probe(struct i2c_client *new_client,
+                     const struct i2c_device_id *id)
+{
+       struct lm83_data *data;
+       int err;
+
+       data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL);
+       if (!data) {
+               err = -ENOMEM;
+               goto exit;
+       }
+
+       i2c_set_clientdata(new_client, data);
        data->valid = 0;
        mutex_init(&data->update_lock);
 
-       /* Tell the I2C layer a new client has arrived */
-       if ((err = i2c_attach_client(new_client)))
-               goto exit_free;
-
        /*
         * Register sysfs hooks
         * The LM82 can only monitor one external diode which is
@@ -389,9 +389,9 @@ static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
         */
 
        if ((err = sysfs_create_group(&new_client->dev.kobj, &lm83_group)))
-               goto exit_detach;
+               goto exit_free;
 
-       if (kind == lm83) {
+       if (id->driver_data == lm83) {
                if ((err = sysfs_create_group(&new_client->dev.kobj,
                                              &lm83_group_opt)))
                        goto exit_remove_files;
@@ -408,26 +408,20 @@ static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
 exit_remove_files:
        sysfs_remove_group(&new_client->dev.kobj, &lm83_group);
        sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
-exit_detach:
-       i2c_detach_client(new_client);
 exit_free:
        kfree(data);
 exit:
        return err;
 }
 
-static int lm83_detach_client(struct i2c_client *client)
+static int lm83_remove(struct i2c_client *client)
 {
        struct lm83_data *data = i2c_get_clientdata(client);
-       int err;
 
        hwmon_device_unregister(data->hwmon_dev);
        sysfs_remove_group(&client->dev.kobj, &lm83_group);
        sysfs_remove_group(&client->dev.kobj, &lm83_group_opt);
 
-       if ((err = i2c_detach_client(client)))
-               return err;
-
        kfree(data);
        return 0;
 }