/*
* This driver handles the LM75 and compatible digital temperature sensors.
- * Compatibles include at least the DS75, DS1775, MCP980x, STDS75, TCN75,
- * TMP100, TMP101, TMP75, TMP175, and TMP275.
+ * Only types which are _not_ listed in I2C_CLIENT_INSMOD_*() need to be
+ * listed here. We start at 9 since I2C_CLIENT_INSMOD_*() currently allow
+ * definition of up to 8 chip types (plus zero).
*/
-/* Addresses scanned by legacy style driver binding */
+enum lm75_type { /* keep sorted in alphabetical order */
+ ds1775 = 9,
+ ds75,
+ /* lm75 -- in I2C_CLIENT_INSMOD_1() */
+ lm75a,
+ max6625,
+ max6626,
+ mcp980x,
+ stds75,
+ tcn75,
+ tmp100,
+ tmp101,
+ tmp175,
+ tmp275,
+ tmp75,
+};
+
+/* Addresses scanned */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
-/* Insmod parameters (only for legacy style driver binding) */
+/* Insmod parameters */
I2C_CLIENT_INSMOD_1(lm75);
/* Each client has this additional data */
struct lm75_data {
- struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
+ u8 orig_conf;
char valid; /* !=0 if registers are valid */
unsigned long last_updated; /* In jiffies */
u16 temp[3]; /* Register values,
2 = hyst */
};
-static void lm75_init_client(struct i2c_client *client);
static int lm75_read_value(struct i2c_client *client, u8 reg);
static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value);
static struct lm75_data *lm75_update_device(struct device *dev);
/*-----------------------------------------------------------------------*/
-/* "Legacy" I2C driver binding */
+/* device probe and removal */
+
+static int
+lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct lm75_data *data;
+ int status;
+ u8 set_mask, clr_mask;
+ int new;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
+ return -EIO;
+
+ data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+
+ /* Set to LM75 resolution (9 bits, 1/2 degree C) and range.
+ * Then tweak to be more precise when appropriate.
+ */
+ set_mask = 0;
+ clr_mask = (1 << 0) /* continuous conversions */
+ | (1 << 6) | (1 << 5); /* 9-bit mode */
+
+ /* configure as specified */
+ status = lm75_read_value(client, LM75_REG_CONF);
+ if (status < 0) {
+ dev_dbg(&client->dev, "Can't read config? %d\n", status);
+ goto exit_free;
+ }
+ data->orig_conf = status;
+ new = status & ~clr_mask;
+ new |= set_mask;
+ if (status != new)
+ lm75_write_value(client, LM75_REG_CONF, new);
+ dev_dbg(&client->dev, "Config %02x\n", new);
+
+ /* Register sysfs hooks */
+ status = sysfs_create_group(&client->dev.kobj, &lm75_group);
+ if (status)
+ goto exit_free;
+
+ data->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ status = PTR_ERR(data->hwmon_dev);
+ goto exit_remove;
+ }
+
+ dev_info(&client->dev, "%s: sensor '%s'\n",
+ dev_name(data->hwmon_dev), client->name);
-static struct i2c_driver lm75_driver;
+ return 0;
+
+exit_remove:
+ sysfs_remove_group(&client->dev.kobj, &lm75_group);
+exit_free:
+ i2c_set_clientdata(client, NULL);
+ kfree(data);
+ return status;
+}
-/* This function is called by i2c_probe */
-static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
+static int lm75_remove(struct i2c_client *client)
{
+ struct lm75_data *data = i2c_get_clientdata(client);
+
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &lm75_group);
+ lm75_write_value(client, LM75_REG_CONF, data->orig_conf);
+ i2c_set_clientdata(client, NULL);
+ kfree(data);
+ return 0;
+}
+
+static const struct i2c_device_id lm75_ids[] = {
+ { "ds1775", ds1775, },
+ { "ds75", ds75, },
+ { "lm75", lm75, },
+ { "lm75a", lm75a, },
+ { "max6625", max6625, },
+ { "max6626", max6626, },
+ { "mcp980x", mcp980x, },
+ { "stds75", stds75, },
+ { "tcn75", tcn75, },
+ { "tmp100", tmp100, },
+ { "tmp101", tmp101, },
+ { "tmp175", tmp175, },
+ { "tmp275", tmp275, },
+ { "tmp75", tmp75, },
+ { /* LIST END */ }
+};
+MODULE_DEVICE_TABLE(i2c, lm75_ids);
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm75_detect(struct i2c_client *new_client, int kind,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = new_client->adapter;
int i;
- struct i2c_client *new_client;
- struct lm75_data *data;
- int err = 0;
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 address. We create the
- client structure, even though there may be no sensor present.
- But it allows us to use i2c_smbus_read_*_data() calls. */
- if (!(data = kzalloc(sizeof(struct lm75_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 = &lm75_driver;
- new_client->flags = 0;
+ return -ENODEV;
/* Now, we do the remaining detection. There is no identification-
dedicated register so we have to rely on several tricks:
|| i2c_smbus_read_word_data(new_client, 5) != hyst
|| i2c_smbus_read_word_data(new_client, 6) != hyst
|| i2c_smbus_read_word_data(new_client, 7) != hyst)
- goto exit_free;
+ return -ENODEV;
os = i2c_smbus_read_word_data(new_client, 3);
if (i2c_smbus_read_word_data(new_client, 4) != os
|| i2c_smbus_read_word_data(new_client, 5) != os
|| i2c_smbus_read_word_data(new_client, 6) != os
|| i2c_smbus_read_word_data(new_client, 7) != os)
- goto exit_free;
+ return -ENODEV;
/* Unused bits */
if (conf & 0xe0)
- goto exit_free;
+ return -ENODEV;
/* Addresses cycling */
for (i = 8; i < 0xff; i += 8)
if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
|| i2c_smbus_read_word_data(new_client, i + 2) != hyst
|| i2c_smbus_read_word_data(new_client, i + 3) != os)
- goto exit_free;
+ return -ENODEV;
}
- /* NOTE: we treat "force=..." and "force_lm75=..." the same. */
- strlcpy(new_client->name, "lm75", I2C_NAME_SIZE);
-
- /* Fill in the remaining client fields and put it into the global list */
- 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 LM75 chip */
- lm75_init_client(new_client);
-
- /* Register sysfs hooks */
- if ((err = sysfs_create_group(&new_client->dev.kobj, &lm75_group)))
- goto exit_detach;
-
- data->hwmon_dev = hwmon_device_register(&new_client->dev);
- if (IS_ERR(data->hwmon_dev)) {
- err = PTR_ERR(data->hwmon_dev);
- goto exit_remove;
- }
+ /* NOTE: we treat "force=..." and "force_lm75=..." the same.
+ * Only new-style driver binding distinguishes chip types.
+ */
+ strlcpy(info->type, "lm75", I2C_NAME_SIZE);
return 0;
-
-exit_remove:
- sysfs_remove_group(&new_client->dev.kobj, &lm75_group);
-exit_detach:
- i2c_detach_client(new_client);
-exit_free:
- kfree(data);
-exit:
- return err;
-}
-
-static int lm75_attach_adapter(struct i2c_adapter *adapter)
-{
- if (!(adapter->class & I2C_CLASS_HWMON))
- return 0;
- return i2c_probe(adapter, &addr_data, lm75_detect);
-}
-
-static int lm75_detach_client(struct i2c_client *client)
-{
- struct lm75_data *data = i2c_get_clientdata(client);
- hwmon_device_unregister(data->hwmon_dev);
- sysfs_remove_group(&client->dev.kobj, &lm75_group);
- i2c_detach_client(client);
- kfree(data);
- return 0;
}
static struct i2c_driver lm75_driver = {
+ .class = I2C_CLASS_HWMON,
.driver = {
.name = "lm75",
},
- .attach_adapter = lm75_attach_adapter,
- .detach_client = lm75_detach_client,
+ .probe = lm75_probe,
+ .remove = lm75_remove,
+ .id_table = lm75_ids,
+ .detect = lm75_detect,
+ .address_data = &addr_data,
};
/*-----------------------------------------------------------------------*/
return i2c_smbus_write_word_data(client, reg, swab16(value));
}
-static void lm75_init_client(struct i2c_client *client)
-{
- int reg;
-
- /* Enable if in shutdown mode */
- reg = lm75_read_value(client, LM75_REG_CONF);
- if (reg >= 0 && (reg & 0x01))
- lm75_write_value(client, LM75_REG_CONF, reg & 0xfe);
-}
-
static struct lm75_data *lm75_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff