From a189dd62d328db7bf8ba68de6a948fdbc93dca25 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Wed, 16 Jul 2008 19:30:13 +0200 Subject: hwmon: (lm77) Convert to a new-style i2c driver The new-style lm77 driver implements the optional detect() callback to cover the use cases of the legacy driver. Signed-off-by: Jean Delvare Cc: Andras Bali --- drivers/hwmon/lm77.c | 102 +++++++++++++++++++++++---------------------------- 1 file changed, 45 insertions(+), 57 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/lm77.c b/drivers/hwmon/lm77.c index 36d5a8c3ad8..866b401ab6e 100644 --- a/drivers/hwmon/lm77.c +++ b/drivers/hwmon/lm77.c @@ -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_alarm, S_IRUGO, show_alarm, NULL, 2); 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_group = { .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_adapter *adapter, int address, int kind) || 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_adapter *adapter, int address, int kind) || ((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_adapter *adapter, int address, int kind) 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; } -- cgit