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>
diff --git a/drivers/hwmon/w83l785ts.c b/drivers/hwmon/w83l785ts.c
index 52e268e..ea295b9 100644
--- a/drivers/hwmon/w83l785ts.c
+++ b/drivers/hwmon/w83l785ts.c
@@ -81,10 +81,11 @@
* 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 @@
* 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 @@
*/
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 @@
* Real code
*/
-static int w83l785ts_attach_adapter(struct i2c_adapter *adapter)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int w83l785ts_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, 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)
-{
- 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 @@
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 @@
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 @@
&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 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 @@
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;
}
