hwmon: (lm90) Convert to a new-style i2c driver
The new-style lm90 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/lm90.c b/drivers/hwmon/lm90.c
index d1a3da3..c24fe36 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -187,23 +187,44 @@
* Functions declaration
*/
-static int lm90_attach_adapter(struct i2c_adapter *adapter);
-static int lm90_detect(struct i2c_adapter *adapter, int address,
- int kind);
+static int lm90_detect(struct i2c_client *client, int kind,
+ struct i2c_board_info *info);
+static int lm90_probe(struct i2c_client *client,
+ const struct i2c_device_id *id);
static void lm90_init_client(struct i2c_client *client);
-static int lm90_detach_client(struct i2c_client *client);
+static int lm90_remove(struct i2c_client *client);
static struct lm90_data *lm90_update_device(struct device *dev);
/*
* Driver data (common to all clients)
*/
+static const struct i2c_device_id lm90_id[] = {
+ { "adm1032", adm1032 },
+ { "adt7461", adt7461 },
+ { "lm90", lm90 },
+ { "lm86", lm86 },
+ { "lm89", lm99 },
+ { "lm99", lm99 }, /* Missing temperature offset */
+ { "max6657", max6657 },
+ { "max6658", max6657 },
+ { "max6659", max6657 },
+ { "max6680", max6680 },
+ { "max6681", max6680 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lm90_id);
+
static struct i2c_driver lm90_driver = {
+ .class = I2C_CLASS_HWMON,
.driver = {
.name = "lm90",
},
- .attach_adapter = lm90_attach_adapter,
- .detach_client = lm90_detach_client,
+ .probe = lm90_probe,
+ .remove = lm90_remove,
+ .id_table = lm90_id,
+ .detect = lm90_detect,
+ .address_data = &addr_data,
};
/*
@@ -211,7 +232,6 @@
*/
struct lm90_data {
- struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
@@ -477,40 +497,16 @@
return 0;
}
-static int lm90_attach_adapter(struct i2c_adapter *adapter)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm90_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, lm90_detect);
-}
-
-/*
- * The following function does more than just detection. If detection
- * succeeds, it also registers the new chip.
- */
-static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
-{
- struct i2c_client *new_client;
- struct lm90_data *data;
- int err = 0;
+ struct i2c_adapter *adapter = new_client->adapter;
+ int address = new_client->addr;
const char *name = "";
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
- goto exit;
-
- if (!(data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
-
- /* The common I2C client data is placed right before the
- LM90-specific data. */
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &lm90_driver;
- new_client->flags = 0;
+ return -ENODEV;
/*
* Now we do the remaining detection. A negative kind means that
@@ -538,7 +534,7 @@
LM90_REG_R_CONFIG1)) < 0
|| (reg_convrate = i2c_smbus_read_byte_data(new_client,
LM90_REG_R_CONVRATE)) < 0)
- goto exit_free;
+ return -ENODEV;
if ((address == 0x4C || address == 0x4D)
&& man_id == 0x01) { /* National Semiconductor */
@@ -546,7 +542,7 @@
if ((reg_config2 = i2c_smbus_read_byte_data(new_client,
LM90_REG_R_CONFIG2)) < 0)
- goto exit_free;
+ return -ENODEV;
if ((reg_config1 & 0x2A) == 0x00
&& (reg_config2 & 0xF8) == 0x00
@@ -610,10 +606,11 @@
dev_info(&adapter->dev,
"Unsupported chip (man_id=0x%02X, "
"chip_id=0x%02X).\n", man_id, chip_id);
- goto exit_free;
+ return -ENODEV;
}
}
+ /* Fill the i2c board info */
if (kind == lm90) {
name = "lm90";
} else if (kind == adm1032) {
@@ -621,7 +618,7 @@
/* The ADM1032 supports PEC, but only if combined
transactions are not used. */
if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
- new_client->flags |= I2C_CLIENT_PEC;
+ info->flags |= I2C_CLIENT_PEC;
} else if (kind == lm99) {
name = "lm99";
} else if (kind == lm86) {
@@ -633,23 +630,39 @@
} else if (kind == adt7461) {
name = "adt7461";
}
+ strlcpy(info->type, name, I2C_NAME_SIZE);
- /* We can fill in the remaining client fields */
- strlcpy(new_client->name, name, I2C_NAME_SIZE);
- data->valid = 0;
- data->kind = kind;
+ return 0;
+}
+
+static int lm90_probe(struct i2c_client *new_client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent);
+ struct lm90_data *data;
+ int err;
+
+ data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit;
+ }
+ i2c_set_clientdata(new_client, data);
mutex_init(&data->update_lock);
- /* Tell the I2C layer a new client has arrived */
- if ((err = i2c_attach_client(new_client)))
- goto exit_free;
+ /* Set the device type */
+ data->kind = id->driver_data;
+ if (data->kind == adm1032) {
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+ new_client->flags &= ~I2C_CLIENT_PEC;
+ }
/* Initialize the LM90 chip */
lm90_init_client(new_client);
/* Register sysfs hooks */
if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group)))
- goto exit_detach;
+ goto exit_free;
if (new_client->flags & I2C_CLIENT_PEC) {
if ((err = device_create_file(&new_client->dev,
&dev_attr_pec)))
@@ -672,8 +685,6 @@
exit_remove_files:
sysfs_remove_group(&new_client->dev.kobj, &lm90_group);
device_remove_file(&new_client->dev, &dev_attr_pec);
-exit_detach:
- i2c_detach_client(new_client);
exit_free:
kfree(data);
exit:
@@ -710,10 +721,9 @@
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
}
-static int lm90_detach_client(struct i2c_client *client)
+static int lm90_remove(struct i2c_client *client)
{
struct lm90_data *data = i2c_get_clientdata(client);
- int err;
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &lm90_group);
@@ -722,9 +732,6 @@
device_remove_file(&client->dev,
&sensor_dev_attr_temp2_offset.dev_attr);
- if ((err = i2c_detach_client(client)))
- return err;
-
kfree(data);
return 0;
}