diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/Kconfig | 20 | ||||
| -rw-r--r-- | drivers/hwmon/lm75.c | 90 |
2 files changed, 64 insertions, 46 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 00ff53348491..86289c283dc8 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -394,13 +394,19 @@ config SENSORS_LM75 tristate "National Semiconductor LM75 and compatibles" depends on I2C help - If you say yes here you get support for National Semiconductor LM75 - sensor chips and clones: Dallas Semiconductor DS75 and DS1775 (in - 9-bit precision mode), and TelCom (now Microchip) TCN75. - - The DS75 and DS1775 in 10- to 12-bit precision modes will require - a force module parameter. The driver will not handle the extra - precision anyhow. + If you say yes here you get support for one common type of + temperature sensor chip, with models including: + + - Dallas Semiconductor DS75 and DS1775 + - Maxim MAX6625 and MAX6626 + - Microchip MCP980x + - National Semiconductor LM75 + - NXP's LM75A + - ST Microelectronics STDS75 + - TelCom (now Microchip) TCN75 + - Texas Instruments TMP100, TMP101, TMP75, TMP175, TMP275 + + Most of these chips will require a "force" module parameter. This driver can also be built as a module. If so, the module will be called lm75. diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index de698dc73020..25ed26584100 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -30,14 +30,19 @@ #include "lm75.h" -/* Addresses to scan */ +/* + * 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. + */ + +/* Addresses scanned by legacy style driver binding */ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; -/* Insmod parameters */ +/* Insmod parameters (only for legacy style driver binding) */ I2C_CLIENT_INSMOD_1(lm75); -/* Many LM75 constants specified below */ /* The LM75 registers */ #define LM75_REG_CONF 0x01 @@ -50,9 +55,9 @@ static const u8 LM75_REG_TEMP[3] = { /* Each client has this additional data */ struct lm75_data { struct i2c_client client; - struct device *hwmon_dev; + struct device *hwmon_dev; struct mutex update_lock; - char valid; /* !=0 if following fields are valid */ + char valid; /* !=0 if registers are valid */ unsigned long last_updated; /* In jiffies */ u16 temp[3]; /* Register values, 0 = input @@ -60,23 +65,15 @@ struct lm75_data { 2 = hyst */ }; -static int lm75_attach_adapter(struct i2c_adapter *adapter); -static int lm75_detect(struct i2c_adapter *adapter, int address, int kind); static void lm75_init_client(struct i2c_client *client); -static int lm75_detach_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); -/* This is the driver that will be inserted */ -static struct i2c_driver lm75_driver = { - .driver = { - .name = "lm75", - }, - .attach_adapter = lm75_attach_adapter, - .detach_client = lm75_detach_client, -}; +/*-----------------------------------------------------------------------*/ + +/* sysfs attributes for hwmon */ static ssize_t show_temp(struct device *dev, struct device_attribute *da, char *buf) @@ -109,13 +106,6 @@ static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp, set_temp, 2); static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); -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 struct attribute *lm75_attributes[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, @@ -128,6 +118,12 @@ static const struct attribute_group lm75_group = { .attrs = lm75_attributes, }; +/*-----------------------------------------------------------------------*/ + +/* "Legacy" I2C driver binding */ + +static struct i2c_driver lm75_driver; + /* This function is called by i2c_probe */ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) { @@ -135,15 +131,14 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) struct i2c_client *new_client; struct lm75_data *data; int err = 0; - const char *name = ""; 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 lm75_{read,write}_value. */ + /* 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; @@ -174,17 +169,17 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) || 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; + goto exit_free; 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; + goto exit_free; /* Unused bits */ if (conf & 0xe0) - goto exit_free; + goto exit_free; /* Addresses cycling */ for (i = 8; i < 0xff; i += 8) @@ -194,16 +189,10 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) goto exit_free; } - /* Determine the chip type - only one kind supported! */ - if (kind <= 0) - kind = lm75; - - if (kind == lm75) { - name = "lm75"; - } + /* 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 */ - strlcpy(new_client->name, name, I2C_NAME_SIZE); data->valid = 0; mutex_init(&data->update_lock); @@ -213,7 +202,7 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) /* 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; @@ -236,6 +225,13 @@ 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); @@ -246,6 +242,18 @@ static int lm75_detach_client(struct i2c_client *client) return 0; } +static struct i2c_driver lm75_driver = { + .driver = { + .name = "lm75", + }, + .attach_adapter = lm75_attach_adapter, + .detach_client = lm75_detach_client, +}; + +/*-----------------------------------------------------------------------*/ + +/* register access */ + /* All registers are word-sized, except for the configuration register. LM75 uses a high-byte first convention, which is exactly opposite to the SMBus standard. */ @@ -309,6 +317,10 @@ static struct lm75_data *lm75_update_device(struct device *dev) return data; } +/*-----------------------------------------------------------------------*/ + +/* module glue */ + static int __init sensors_lm75_init(void) { return i2c_add_driver(&lm75_driver); |