hwmon: (adm1021) Convert to a new-style i2c driver

The new-style adm1021 driver implements the optional detect() callback
to cover the use cases of the legacy driver.

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

1 files changed, 53 insertions, 52 deletions

diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c
index ecbf69484bf..b11e06f644b 100644
--- a/drivers/hwmon/adm1021.c
+++ b/drivers/hwmon/adm1021.c
@@ -78,7 +78,6 @@ clearing it.  Weird, ey?   --Phil  */
 
 /* Each client has this additional data */
 struct adm1021_data {
-        struct i2c_client client;
         struct device *hwmon_dev;
         enum chips type;
 
@@ -98,23 +97,42 @@ struct adm1021_data {
         u8 remote_temp_offset_prec;
 };
 
-static int adm1021_attach_adapter(struct i2c_adapter *adapter);
-static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
+static int adm1021_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id);
+static int adm1021_detect(struct i2c_client *client, int kind,
+                          struct i2c_board_info *info);
 static void adm1021_init_client(struct i2c_client *client);
-static int adm1021_detach_client(struct i2c_client *client);
+static int adm1021_remove(struct i2c_client *client);
 static struct adm1021_data *adm1021_update_device(struct device *dev);
 
 /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
 static int read_only;
 
 
+static const struct i2c_device_id adm1021_id[] = {
+        { "adm1021", adm1021 },
+        { "adm1023", adm1023 },
+        { "max1617", max1617 },
+        { "max1617a", max1617a },
+        { "thmc10", thmc10 },
+        { "lm84", lm84 },
+        { "gl523sm", gl523sm },
+        { "mc1066", mc1066 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, adm1021_id);
+
 /* This is the driver that will be inserted */
 static struct i2c_driver adm1021_driver = {
+        .class          = I2C_CLASS_HWMON,
         .driver = {
                 .name   = "adm1021",
         },
-        .attach_adapter = adm1021_attach_adapter,
-        .detach_client  = adm1021_detach_client,
+        .probe          = adm1021_probe,
+        .remove         = adm1021_remove,
+        .id_table       = adm1021_id,
+        .detect         = adm1021_detect,
+        .address_data   = &addr_data,
 };
 
 static ssize_t show_temp(struct device *dev,
@@ -216,13 +234,6 @@ static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
 
 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 
-static int adm1021_attach_adapter(struct i2c_adapter *adapter)
-{
-        if (!(adapter->class & I2C_CLASS_HWMON))
-                return 0;
-        return i2c_probe(adapter, &addr_data, adm1021_detect);
-}
-
 static struct attribute *adm1021_attributes[] = {
         &sensor_dev_attr_temp1_max.dev_attr.attr,
         &sensor_dev_attr_temp1_min.dev_attr.attr,
@@ -243,36 +254,21 @@ static const struct attribute_group adm1021_group = {
         .attrs = adm1021_attributes,
 };
 
-static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int adm1021_detect(struct i2c_client *client, int kind,
+                          struct i2c_board_info *info)
 {
+        struct i2c_adapter *adapter = client->adapter;
         int i;
-        struct i2c_client *client;
-        struct adm1021_data *data;
-        int err = 0;
         const char *type_name = "";
         int conv_rate, status, config;
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
                 pr_debug("adm1021: detect failed, "
                          "smbus byte data not supported!\n");
-                goto error0;
-        }
-
-        /* 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 adm1021 register values. */
-
-        if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
-                pr_debug("adm1021: detect failed, kzalloc failed!\n");
-                err = -ENOMEM;
-                goto error0;
+                return -ENODEV;
         }
 
-        client = &data->client;
-        i2c_set_clientdata(client, data);
-        client->addr = address;
-        client->adapter = adapter;
-        client->driver = &adm1021_driver;
         status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
         conv_rate = i2c_smbus_read_byte_data(client,
                                              ADM1021_REG_CONV_RATE_R);
@@ -284,8 +280,7 @@ static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
                     || (conv_rate & 0xF8) != 0x00) {
                         pr_debug("adm1021: detect failed, "
                                  "chip not detected!\n");
-                        err = -ENODEV;
-                        goto error1;
+                        return -ENODEV;
                 }
         }
 
@@ -336,24 +331,36 @@ static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
                 type_name = "mc1066";
         }
         pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
-                 type_name, i2c_adapter_id(adapter), address);
+                 type_name, i2c_adapter_id(adapter), client->addr);
+        strlcpy(info->type, type_name, I2C_NAME_SIZE);
 
-        /* Fill in the remaining client fields */
-        strlcpy(client->name, type_name, I2C_NAME_SIZE);
-        data->type = kind;
-        mutex_init(&data->update_lock);
+        return 0;
+}
 
-        /* Tell the I2C layer a new client has arrived */
-        if ((err = i2c_attach_client(client)))
-                goto error1;
+static int adm1021_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id)
+{
+        struct adm1021_data *data;
+        int err;
+
+        data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL);
+        if (!data) {
+                pr_debug("adm1021: detect failed, kzalloc failed!\n");
+                err = -ENOMEM;
+                goto error0;
+        }
+
+        i2c_set_clientdata(client, data);
+        data->type = id->driver_data;
+        mutex_init(&data->update_lock);
 
         /* Initialize the ADM1021 chip */
-        if (kind != lm84 && !read_only)
+        if (data->type != lm84 && !read_only)
                 adm1021_init_client(client);
 
         /* Register sysfs hooks */
         if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group)))
-                goto error2;
+                goto error1;
 
         data->hwmon_dev = hwmon_device_register(&client->dev);
         if (IS_ERR(data->hwmon_dev)) {
@@ -365,8 +372,6 @@ static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
 
 error3:
         sysfs_remove_group(&client->dev.kobj, &adm1021_group);
-error2:
-        i2c_detach_client(client);
 error1:
         kfree(data);
 error0:
@@ -382,17 +387,13 @@ static void adm1021_init_client(struct i2c_client *client)
         i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
 }
 
-static int adm1021_detach_client(struct i2c_client *client)
+static int adm1021_remove(struct i2c_client *client)
 {
         struct adm1021_data *data = i2c_get_clientdata(client);
-        int err;
 
         hwmon_device_unregister(data->hwmon_dev);
         sysfs_remove_group(&client->dev.kobj, &adm1021_group);
 
-        if ((err = i2c_detach_client(client)))
-                return err;
-
         kfree(data);
         return 0;
 }