hwmon: (lm87) Convert to a new-style i2c driver

The new-style lm87 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: Ben Hutchings <bhutchings@solarflare.com>

1 files changed, 46 insertions, 53 deletions

diff --git a/drivers/hwmon/lm87.c b/drivers/hwmon/lm87.c
index e1c183f0aae0..21970f0d53a1 100644
--- a/drivers/hwmon/lm87.c
+++ b/drivers/hwmon/lm87.c
@@ -5,7 +5,7 @@
  *                          Philip Edelbrock <phil@netroedge.com>
  *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
  *                          Dan Eaton <dan.eaton@rocketlogix.com>
- * Copyright (C) 2004,2007  Jean Delvare <khali@linux-fr.org>
+ * Copyright (C) 2004-2008  Jean Delvare <khali@linux-fr.org>
  *
  * Original port to Linux 2.6 by Jeff Oliver.
  *
@@ -157,22 +157,35 @@ static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  * Functions declaration
  */
 
-static int lm87_attach_adapter(struct i2c_adapter *adapter);
-static int lm87_detect(struct i2c_adapter *adapter, int address, int kind);
+static int lm87_probe(struct i2c_client *client,
+                      const struct i2c_device_id *id);
+static int lm87_detect(struct i2c_client *new_client, int kind,
+                       struct i2c_board_info *info);
 static void lm87_init_client(struct i2c_client *client);
-static int lm87_detach_client(struct i2c_client *client);
+static int lm87_remove(struct i2c_client *client);
 static struct lm87_data *lm87_update_device(struct device *dev);
 
 /*
  * Driver data (common to all clients)
  */
 
+static const struct i2c_device_id lm87_id[] = {
+        { "lm87", lm87 },
+        { "adm1024", adm1024 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, lm87_id);
+
 static struct i2c_driver lm87_driver = {
+        .class          = I2C_CLASS_HWMON,
         .driver = {
                 .name   = "lm87",
         },
-        .attach_adapter = lm87_attach_adapter,
-        .detach_client  = lm87_detach_client,
+        .probe          = lm87_probe,
+        .remove         = lm87_remove,
+        .id_table       = lm87_id,
+        .detect         = lm87_detect,
+        .address_data   = &addr_data,
 };
 
 /*
@@ -180,7 +193,6 @@ static struct i2c_driver lm87_driver = {
  */
 
 struct lm87_data {
-        struct i2c_client client;
         struct device *hwmon_dev;
         struct mutex update_lock;
         char valid; /* zero until following fields are valid */
@@ -562,13 +574,6 @@ static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
  * Real code
  */
 
-static int lm87_attach_adapter(struct i2c_adapter *adapter)
-{
-        if (!(adapter->class & I2C_CLASS_HWMON))
-                return 0;
-        return i2c_probe(adapter, &addr_data, lm87_detect);
-}
-
 static struct attribute *lm87_attributes[] = {
         &dev_attr_in1_input.attr,
         &dev_attr_in1_min.attr,
@@ -656,33 +661,15 @@ static const struct attribute_group lm87_group_opt = {
         .attrs = lm87_attributes_opt,
 };
 
-/*
- * The following function does more than just detection. If detection
- * succeeds, it also registers the new chip.
- */
-static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm87_detect(struct i2c_client *new_client, int kind,
+                       struct i2c_board_info *info)
 {
-        struct i2c_client *new_client;
-        struct lm87_data *data;
-        int err = 0;
+        struct i2c_adapter *adapter = new_client->adapter;
         static const char *names[] = { "lm87", "adm1024" };
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-                goto exit;
-
-        if (!(data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL))) {
-                err = -ENOMEM;
-                goto exit;
-        }
-
-        /* The common I2C client data is placed right before the
-           LM87-specific data. */
-        new_client = &data->client;
-        i2c_set_clientdata(new_client, data);
-        new_client->addr = address;
-        new_client->adapter = adapter;
-        new_client->driver = &lm87_driver;
-        new_client->flags = 0;
+                return -ENODEV;
 
         /* Default to an LM87 if forced */
         if (kind == 0)
@@ -704,20 +691,32 @@ static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
                  || (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)) {
                         dev_dbg(&adapter->dev,
                                 "LM87 detection failed at 0x%02x.\n",
-                                address);
-                        goto exit_free;
+                                new_client->addr);
+                        return -ENODEV;
                 }
         }
 
-        /* We can fill in the remaining client fields */
-        strlcpy(new_client->name, names[kind - 1], I2C_NAME_SIZE);
+        strlcpy(info->type, names[kind - 1], I2C_NAME_SIZE);
+
+        return 0;
+}
+
+static int lm87_probe(struct i2c_client *new_client,
+                      const struct i2c_device_id *id)
+{
+        struct lm87_data *data;
+        int err;
+
+        data = kzalloc(sizeof(struct lm87_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;
-
         /* Initialize the LM87 chip */
         lm87_init_client(new_client);
 
@@ -732,7 +731,7 @@ static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
 
         /* Register sysfs hooks */
         if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
-                goto exit_detach;
+                goto exit_free;
 
         if (data->channel & CHAN_NO_FAN(0)) {
                 if ((err = device_create_file(&new_client->dev,
@@ -832,8 +831,6 @@ static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
 exit_remove:
         sysfs_remove_group(&new_client->dev.kobj, &lm87_group);
         sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt);
-exit_detach:
-        i2c_detach_client(new_client);
 exit_free:
         kfree(data);
 exit:
@@ -877,18 +874,14 @@ static void lm87_init_client(struct i2c_client *client)
         }
 }
 
-static int lm87_detach_client(struct i2c_client *client)
+static int lm87_remove(struct i2c_client *client)
 {
         struct lm87_data *data = i2c_get_clientdata(client);
-        int err;
 
         hwmon_device_unregister(data->hwmon_dev);
         sysfs_remove_group(&client->dev.kobj, &lm87_group);
         sysfs_remove_group(&client->dev.kobj, &lm87_group_opt);
 
-        if ((err = i2c_detach_client(client)))
-                return err;
-
         kfree(data);
         return 0;
 }