hwmon: (w83l785ts) Convert to a new-style i2c driver

The new-style w83l785ts 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, 60 insertions, 57 deletions

diff --git a/drivers/hwmon/w83l785ts.c b/drivers/hwmon/w83l785ts.c
index 52e268e25dab..ea295b9fc4f4 100644
--- a/drivers/hwmon/w83l785ts.c
+++ b/drivers/hwmon/w83l785ts.c
@@ -81,10 +81,11 @@ I2C_CLIENT_INSMOD_1(w83l785ts);
  * Functions declaration
  */
 
-static int w83l785ts_attach_adapter(struct i2c_adapter *adapter);
-static int w83l785ts_detect(struct i2c_adapter *adapter, int address,
-        int kind);
-static int w83l785ts_detach_client(struct i2c_client *client);
+static int w83l785ts_probe(struct i2c_client *client,
+                           const struct i2c_device_id *id);
+static int w83l785ts_detect(struct i2c_client *client, int kind,
+                            struct i2c_board_info *info);
+static int w83l785ts_remove(struct i2c_client *client);
 static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval);
 static struct w83l785ts_data *w83l785ts_update_device(struct device *dev);
 
@@ -92,12 +93,22 @@ static struct w83l785ts_data *w83l785ts_update_device(struct device *dev);
  * Driver data (common to all clients)
  */
  
+static const struct i2c_device_id w83l785ts_id[] = {
+        { "w83l785ts", w83l785ts },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, w83l785ts_id);
+
 static struct i2c_driver w83l785ts_driver = {
+        .class          = I2C_CLASS_HWMON,
         .driver = {
                 .name   = "w83l785ts",
         },
-        .attach_adapter = w83l785ts_attach_adapter,
-        .detach_client  = w83l785ts_detach_client,
+        .probe          = w83l785ts_probe,
+        .remove         = w83l785ts_remove,
+        .id_table       = w83l785ts_id,
+        .detect         = w83l785ts_detect,
+        .address_data   = &addr_data,
 };
 
 /*
@@ -105,7 +116,6 @@ static struct i2c_driver w83l785ts_driver = {
  */
 
 struct w83l785ts_data {
-        struct i2c_client client;
         struct device *hwmon_dev;
         struct mutex update_lock;
         char valid; /* zero until following fields are valid */
@@ -135,40 +145,14 @@ static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1);
  * Real code
  */
 
-static int w83l785ts_attach_adapter(struct i2c_adapter *adapter)
-{
-        if (!(adapter->class & I2C_CLASS_HWMON))
-                return 0;
-        return i2c_probe(adapter, &addr_data, w83l785ts_detect);
-}
-
-/*
- * The following function does more than just detection. If detection
- * succeeds, it also registers the new chip.
- */
-static int w83l785ts_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int w83l785ts_detect(struct i2c_client *new_client, int kind,
+                            struct i2c_board_info *info)
 {
-        struct i2c_client *new_client;
-        struct w83l785ts_data *data;
-        int err = 0;
-
+        struct i2c_adapter *adapter = new_client->adapter;
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-                goto exit;
-
-        if (!(data = kzalloc(sizeof(struct w83l785ts_data), GFP_KERNEL))) {
-                err = -ENOMEM;
-                goto exit;
-        }
-
-        /* The common I2C client data is placed right before the
-         * W83L785TS-specific data. */
-        new_client = &data->client;
-        i2c_set_clientdata(new_client, data);
-        new_client->addr = address;
-        new_client->adapter = adapter;
-        new_client->driver = &w83l785ts_driver;
-        new_client->flags = 0;
+                return -ENODEV;
 
         /*
          * Now we do the remaining detection. A negative kind means that
@@ -188,8 +172,8 @@ static int w83l785ts_detect(struct i2c_adapter *adapter, int address, int kind)
                       W83L785TS_REG_TYPE, 0) & 0xFC) != 0x00)) {
                         dev_dbg(&adapter->dev,
                                 "W83L785TS-S detection failed at 0x%02x.\n",
-                                address);
-                        goto exit_free;
+                                new_client->addr);
+                        return -ENODEV;
                 }
         }
 
@@ -214,22 +198,34 @@ static int w83l785ts_detect(struct i2c_adapter *adapter, int address, int kind)
                         dev_info(&adapter->dev,
                                  "Unsupported chip (man_id=0x%04X, "
                                  "chip_id=0x%02X).\n", man_id, chip_id);
-                        goto exit_free;
+                        return -ENODEV;
                 }
         }
 
-        /* We can fill in the remaining client fields. */
-        strlcpy(new_client->name, "w83l785ts", I2C_NAME_SIZE);
+        strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE);
+
+        return 0;
+}
+
+static int w83l785ts_probe(struct i2c_client *new_client,
+                           const struct i2c_device_id *id)
+{
+        struct w83l785ts_data *data;
+        int err = 0;
+
+        data = kzalloc(sizeof(struct w83l785ts_data), GFP_KERNEL);
+        if (!data) {
+                err = -ENOMEM;
+                goto exit;
+        }
+
+        i2c_set_clientdata(new_client, data);
         data->valid = 0;
         mutex_init(&data->update_lock);
 
         /* Default values in case the first read fails (unlikely). */
         data->temp[1] = data->temp[0] = 0;
 
-        /* Tell the I2C layer a new client has arrived. */
-        if ((err = i2c_attach_client(new_client))) 
-                goto exit_free;
-
         /*
          * Initialize the W83L785TS chip
          * Nothing yet, assume it is already started.
@@ -259,25 +255,20 @@ exit_remove:
                            &sensor_dev_attr_temp1_input.dev_attr);
         device_remove_file(&new_client->dev,
                            &sensor_dev_attr_temp1_max.dev_attr);
-        i2c_detach_client(new_client);
-exit_free:
         kfree(data);
 exit:
         return err;
 }
 
-static int w83l785ts_detach_client(struct i2c_client *client)
+static int w83l785ts_remove(struct i2c_client *client)
 {
         struct w83l785ts_data *data = i2c_get_clientdata(client);
-        int err;
 
         hwmon_device_unregister(data->hwmon_dev);
         device_remove_file(&client->dev,
                            &sensor_dev_attr_temp1_input.dev_attr);
         device_remove_file(&client->dev,
                            &sensor_dev_attr_temp1_max.dev_attr);
-        if ((err = i2c_detach_client(client)))
-                return err;
 
         kfree(data);
         return 0;
@@ -286,6 +277,18 @@ static int w83l785ts_detach_client(struct i2c_client *client)
 static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
 {
         int value, i;
+        struct device *dev;
+        const char *prefix;
+
+        /* We might be called during detection, at which point the client
+           isn't yet fully initialized, so we can't use dev_dbg on it */
+        if (i2c_get_clientdata(client)) {
+                dev = &client->dev;
+                prefix = "";
+        } else {
+                dev = &client->adapter->dev;
+                prefix = "w83l785ts: ";
+        }
 
         /* Frequent read errors have been reported on Asus boards, so we
          * retry on read errors. If it still fails (unlikely), return the
@@ -293,15 +296,15 @@ static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
         for (i = 1; i <= MAX_RETRIES; i++) {
                 value = i2c_smbus_read_byte_data(client, reg);
                 if (value >= 0) {
-                        dev_dbg(&client->dev, "Read 0x%02x from register "
-                                "0x%02x.\n", value, reg);
+                        dev_dbg(dev, "%sRead 0x%02x from register 0x%02x.\n",
+                                prefix, value, reg);
                         return value;
                 }
-                dev_dbg(&client->dev, "Read failed, will retry in %d.\n", i);
+                dev_dbg(dev, "%sRead failed, will retry in %d.\n", prefix, i);
                 msleep(i);
         }
 
-        dev_err(&client->dev, "Couldn't read value from register 0x%02x.\n",
+        dev_err(dev, "%sCouldn't read value from register 0x%02x.\n", prefix,
                 reg);
         return defval;
 }