The new-style lm77 driver implements the optional detect() callback
to cover the use cases of the legacy driver.
Signed-off-by: Jean Delvare <khali at linux-fr.org>
Cc: Andras Bali <drewie at freemail.hu>
---
drivers/hwmon/lm77.c | 102 ++++++++++++++++++++++----------------------------
1 file changed, 45 insertions(+), 57 deletions(-)
--- linux-2.6.26-rc9.orig/drivers/hwmon/lm77.c 2008-07-12 09:20:29.000000000 +0200
+++ linux-2.6.26-rc9/drivers/hwmon/lm77.c 2008-07-12 10:27:19.000000000 +0200
@@ -52,7 +52,6 @@ I2C_CLIENT_INSMOD_1(lm77);
/* Each client has this additional data */
struct lm77_data {
- struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid;
@@ -65,23 +64,35 @@ struct lm77_data {
u8 alarms;
};
-static int lm77_attach_adapter(struct i2c_adapter *adapter);
-static int lm77_detect(struct i2c_adapter *adapter, int address, int kind);
+static int lm77_probe(struct i2c_client *client,
+ const struct i2c_device_id *id);
+static int lm77_detect(struct i2c_client *client, int kind,
+ struct i2c_board_info *info);
static void lm77_init_client(struct i2c_client *client);
-static int lm77_detach_client(struct i2c_client *client);
+static int lm77_remove(struct i2c_client *client);
static u16 lm77_read_value(struct i2c_client *client, u8 reg);
static int lm77_write_value(struct i2c_client *client, u8 reg, u16 value);
static struct lm77_data *lm77_update_device(struct device *dev);
+static const struct i2c_device_id lm77_id[] = {
+ { "lm77", lm77 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lm77_id);
+
/* This is the driver that will be inserted */
static struct i2c_driver lm77_driver = {
+ .class = I2C_CLASS_HWMON,
.driver = {
.name = "lm77",
},
- .attach_adapter = lm77_attach_adapter,
- .detach_client = lm77_detach_client,
+ .probe = lm77_probe,
+ .remove = lm77_remove,
+ .id_table = lm77_id,
+ .detect = lm77_detect,
+ .address_data = &addr_data,
};
/* straight from the datasheet */
@@ -215,13 +226,6 @@ static SENSOR_DEVICE_ATTR(temp1_crit_ala
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1);
-static int lm77_attach_adapter(struct i2c_adapter *adapter)
-{
- if (!(adapter->class & I2C_CLASS_HWMON))
- return 0;
- return i2c_probe(adapter, &addr_data, lm77_detect);
-}
-
static struct attribute *lm77_attributes[] = {
&dev_attr_temp1_input.attr,
&dev_attr_temp1_crit.attr,
@@ -240,32 +244,15 @@ static const struct attribute_group lm77
.attrs = lm77_attributes,
};
-/* This function is called by i2c_probe */
-static int lm77_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm77_detect(struct i2c_client *new_client, int kind,
+ struct i2c_board_info *info)
{
- struct i2c_client *new_client;
- struct lm77_data *data;
- int err = 0;
- const char *name = "";
+ struct i2c_adapter *adapter = new_client->adapter;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA))
- goto exit;
-
- /* 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 lm77_{read,write}_value. */
- if (!(data = kzalloc(sizeof(struct lm77_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
-
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &lm77_driver;
- new_client->flags = 0;
+ return -ENODEV;
/* Here comes the remaining detection. Since the LM77 has no
register dedicated to identification, we have to rely on the
@@ -294,7 +281,7 @@ static int lm77_detect(struct i2c_adapte
|| i2c_smbus_read_word_data(new_client, i + 3) != crit
|| i2c_smbus_read_word_data(new_client, i + 4) != min
|| i2c_smbus_read_word_data(new_client, i + 5) != max)
- goto exit_free;
+ return -ENODEV;
/* sign bits */
if (((cur & 0x00f0) != 0xf0 && (cur & 0x00f0) != 0x0)
@@ -302,51 +289,55 @@ static int lm77_detect(struct i2c_adapte
|| ((crit & 0x00f0) != 0xf0 && (crit & 0x00f0) != 0x0)
|| ((min & 0x00f0) != 0xf0 && (min & 0x00f0) != 0x0)
|| ((max & 0x00f0) != 0xf0 && (max & 0x00f0) != 0x0))
- goto exit_free;
+ return -ENODEV;
/* unused bits */
if (conf & 0xe0)
- goto exit_free;
+ return -ENODEV;
/* 0x06 and 0x07 return the last read value */
cur = i2c_smbus_read_word_data(new_client, 0);
if (i2c_smbus_read_word_data(new_client, 6) != cur
|| i2c_smbus_read_word_data(new_client, 7) != cur)
- goto exit_free;
+ return -ENODEV;
hyst = i2c_smbus_read_word_data(new_client, 2);
if (i2c_smbus_read_word_data(new_client, 6) != hyst
|| i2c_smbus_read_word_data(new_client, 7) != hyst)
- goto exit_free;
+ return -ENODEV;
min = i2c_smbus_read_word_data(new_client, 4);
if (i2c_smbus_read_word_data(new_client, 6) != min
|| i2c_smbus_read_word_data(new_client, 7) != min)
- goto exit_free;
+ return -ENODEV;
}
- /* Determine the chip type - only one kind supported! */
- if (kind <= 0)
- kind = lm77;
+ strlcpy(info->type, "lm77", I2C_NAME_SIZE);
- if (kind == lm77) {
- name = "lm77";
+ return 0;
+}
+
+static int lm77_probe(struct i2c_client *new_client,
+ const struct i2c_device_id *id)
+{
+ struct lm77_data *data;
+ int err;
+
+ data = kzalloc(sizeof(struct lm77_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit;
}
- /* Fill in the remaining client fields and put it into the global list */
- strlcpy(new_client->name, name, I2C_NAME_SIZE);
+ 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 LM77 chip */
lm77_init_client(new_client);
/* Register sysfs hooks */
if ((err = sysfs_create_group(&new_client->dev.kobj, &lm77_group)))
- goto exit_detach;
+ goto exit_free;
data->hwmon_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->hwmon_dev)) {
@@ -358,20 +349,17 @@ static int lm77_detect(struct i2c_adapte
exit_remove:
sysfs_remove_group(&new_client->dev.kobj, &lm77_group);
-exit_detach:
- i2c_detach_client(new_client);
exit_free:
kfree(data);
exit:
return err;
}
-static int lm77_detach_client(struct i2c_client *client)
+static int lm77_remove(struct i2c_client *client)
{
struct lm77_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &lm77_group);
- i2c_detach_client(client);
kfree(data);
return 0;
}
--
Jean Delvare
