diff options
Diffstat (limited to 'drivers/hwmon/tmp401.c')
| -rw-r--r-- | drivers/hwmon/tmp401.c | 565 |
1 files changed, 565 insertions, 0 deletions
diff --git a/drivers/hwmon/tmp401.c b/drivers/hwmon/tmp401.c new file mode 100644 index 00000000000..49932de571e --- /dev/null +++ b/drivers/hwmon/tmp401.c @@ -0,0 +1,565 @@ +/* tmp401.c + * + * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* + * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC. + * + * Note this IC is in some aspect similar to the LM90, but it has quite a + * few differences too, for example the local temp has a higher resolution + * and thus has 16 bits registers for its value and limit instead of 8 bits. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/sysfs.h> + +/* Addresses to scan */ +static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END }; + +/* Insmod parameters */ +I2C_CLIENT_INSMOD_1(tmp401); + + +/* + * The TMP401 registers, note some registers have different addresses for + * reading and writing + */ +#define TMP401_STATUS 0x02 +#define TMP401_CONFIG_READ 0x03 +#define TMP401_CONFIG_WRITE 0x09 +#define TMP401_CONVERSION_RATE_READ 0x04 +#define TMP401_CONVERSION_RATE_WRITE 0x0A +#define TMP401_TEMP_CRIT_HYST 0x21 +#define TMP401_CONSECUTIVE_ALERT 0x22 +#define TMP401_MANUFACTURER_ID_REG 0xFE +#define TMP401_DEVICE_ID_REG 0xFF + +static const u8 TMP401_TEMP_MSB[2] = { 0x00, 0x01 }; +static const u8 TMP401_TEMP_LSB[2] = { 0x15, 0x10 }; +static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2] = { 0x06, 0x08 }; +static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2] = { 0x0C, 0x0E }; +static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2] = { 0x17, 0x14 }; +static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2] = { 0x05, 0x07 }; +static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2] = { 0x0B, 0x0D }; +static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2] = { 0x16, 0x13 }; +/* These are called the THERM limit / hysteresis / mask in the datasheet */ +static const u8 TMP401_TEMP_CRIT_LIMIT[2] = { 0x20, 0x19 }; + +/* Flags */ +#define TMP401_CONFIG_RANGE 0x04 +#define TMP401_CONFIG_SHUTDOWN 0x40 +#define TMP401_STATUS_LOCAL_CRIT 0x01 +#define TMP401_STATUS_REMOTE_CRIT 0x02 +#define TMP401_STATUS_REMOTE_OPEN 0x04 +#define TMP401_STATUS_REMOTE_LOW 0x08 +#define TMP401_STATUS_REMOTE_HIGH 0x10 +#define TMP401_STATUS_LOCAL_LOW 0x20 +#define TMP401_STATUS_LOCAL_HIGH 0x40 + +/* Manufacturer / Device ID's */ +#define TMP401_MANUFACTURER_ID 0x55 +#define TMP401_DEVICE_ID 0x11 + +/* + * Functions declarations + */ + +static int tmp401_probe(struct i2c_client *client, + const struct i2c_device_id *id); +static int tmp401_detect(struct i2c_client *client, int kind, + struct i2c_board_info *info); +static int tmp401_remove(struct i2c_client *client); +static struct tmp401_data *tmp401_update_device(struct device *dev); + +/* + * Driver data (common to all clients) + */ + +static const struct i2c_device_id tmp401_id[] = { + { "tmp401", tmp401 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tmp401_id); + +static struct i2c_driver tmp401_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "tmp401", + }, + .probe = tmp401_probe, + .remove = tmp401_remove, + .id_table = tmp401_id, + .detect = tmp401_detect, + .address_data = &addr_data, +}; + +/* + * Client data (each client gets its own) + */ + +struct tmp401_data { + struct device *hwmon_dev; + struct mutex update_lock; + char valid; /* zero until following fields are valid */ + unsigned long last_updated; /* in jiffies */ + + /* register values */ + u8 status; + u8 config; + u16 temp[2]; + u16 temp_low[2]; + u16 temp_high[2]; + u8 temp_crit[2]; + u8 temp_crit_hyst; +}; + +/* + * Sysfs attr show / store functions + */ + +static int tmp401_register_to_temp(u16 reg, u8 config) +{ + int temp = reg; + + if (config & TMP401_CONFIG_RANGE) + temp -= 64 * 256; + + return (temp * 625 + 80) / 160; +} + +static u16 tmp401_temp_to_register(long temp, u8 config) +{ + if (config & TMP401_CONFIG_RANGE) { + temp = SENSORS_LIMIT(temp, -64000, 191000); + temp += 64000; + } else + temp = SENSORS_LIMIT(temp, 0, 127000); + + return (temp * 160 + 312) / 625; +} + +static int tmp401_crit_register_to_temp(u8 reg, u8 config) +{ + int temp = reg; + + if (config & TMP401_CONFIG_RANGE) + temp -= 64; + + return temp * 1000; +} + +static u8 tmp401_crit_temp_to_register(long temp, u8 config) +{ + if (config & TMP401_CONFIG_RANGE) { + temp = SENSORS_LIMIT(temp, -64000, 191000); + temp += 64000; + } else + temp = SENSORS_LIMIT(temp, 0, 127000); + + return (temp + 500) / 1000; +} + +static ssize_t show_temp_value(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + + return sprintf(buf, "%d\n", + tmp401_register_to_temp(data->temp[index], data->config)); +} + +static ssize_t show_temp_min(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + + return sprintf(buf, "%d\n", + tmp401_register_to_temp(data->temp_low[index], data->config)); +} + +static ssize_t show_temp_max(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + + return sprintf(buf, "%d\n", + tmp401_register_to_temp(data->temp_high[index], data->config)); +} + +static ssize_t show_temp_crit(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + + return sprintf(buf, "%d\n", + tmp401_crit_register_to_temp(data->temp_crit[index], + data->config)); +} + +static ssize_t show_temp_crit_hyst(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int temp, index = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + + mutex_lock(&data->update_lock); + temp = tmp401_crit_register_to_temp(data->temp_crit[index], + data->config); + temp -= data->temp_crit_hyst * 1000; + mutex_unlock(&data->update_lock); + + return sprintf(buf, "%d\n", temp); +} + +static ssize_t show_status(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int mask = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + + if (data->status & mask) + return sprintf(buf, "1\n"); + else + return sprintf(buf, "0\n"); +} + +static ssize_t store_temp_min(struct device *dev, struct device_attribute + *devattr, const char *buf, size_t count) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + long val; + u16 reg; + + if (strict_strtol(buf, 10, &val)) + return -EINVAL; + + reg = tmp401_temp_to_register(val, data->config); + + mutex_lock(&data->update_lock); + + i2c_smbus_write_byte_data(to_i2c_client(dev), + TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8); + i2c_smbus_write_byte_data(to_i2c_client(dev), + TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF); + + data->temp_low[index] = reg; + + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t store_temp_max(struct device *dev, struct device_attribute + *devattr, const char *buf, size_t count) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + long val; + u16 reg; + + if (strict_strtol(buf, 10, &val)) + return -EINVAL; + + reg = tmp401_temp_to_register(val, data->config); + + mutex_lock(&data->update_lock); + + i2c_smbus_write_byte_data(to_i2c_client(dev), + TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8); + i2c_smbus_write_byte_data(to_i2c_client(dev), + TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF); + + data->temp_high[index] = reg; + + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t store_temp_crit(struct device *dev, struct device_attribute + *devattr, const char *buf, size_t count) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + long val; + u8 reg; + + if (strict_strtol(buf, 10, &val)) + return -EINVAL; + + reg = tmp401_crit_temp_to_register(val, data->config); + + mutex_lock(&data->update_lock); + + i2c_smbus_write_byte_data(to_i2c_client(dev), + TMP401_TEMP_CRIT_LIMIT[index], reg); + + data->temp_crit[index] = reg; + + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute + *devattr, const char *buf, size_t count) +{ + int temp, index = to_sensor_dev_attr(devattr)->index; + struct tmp401_data *data = tmp401_update_device(dev); + long val; + u8 reg; + + if (strict_strtol(buf, 10, &val)) + return -EINVAL; + + if (data->config & TMP401_CONFIG_RANGE) + val = SENSORS_LIMIT(val, -64000, 191000); + else + val = SENSORS_LIMIT(val, 0, 127000); + + mutex_lock(&data->update_lock); + temp = tmp401_crit_register_to_temp(data->temp_crit[index], + data->config); + val = SENSORS_LIMIT(val, temp - 255000, temp); + reg = ((temp - val) + 500) / 1000; + + i2c_smbus_write_byte_data(to_i2c_client(dev), + TMP401_TEMP_CRIT_HYST, reg); + + data->temp_crit_hyst = reg; + + mutex_unlock(&data->update_lock); + + return count; +} + +static struct sensor_device_attribute tmp401_attr[] = { + SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0), + SENSOR_ATTR(temp1_min, 0644, show_temp_min, store_temp_min, 0), + SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0), + SENSOR_ATTR(temp1_crit, 0644, show_temp_crit, store_temp_crit, 0), + SENSOR_ATTR(temp1_crit_hyst, 0644, show_temp_crit_hyst, + store_temp_crit_hyst, 0), + SENSOR_ATTR(temp1_min_alarm, 0444, show_status, NULL, + TMP401_STATUS_LOCAL_LOW), + SENSOR_ATTR(temp1_max_alarm, 0444, show_status, NULL, + TMP401_STATUS_LOCAL_HIGH), + SENSOR_ATTR(temp1_crit_alarm, 0444, show_status, NULL, + TMP401_STATUS_LOCAL_CRIT), + SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1), + SENSOR_ATTR(temp2_min, 0644, show_temp_min, store_temp_min, 1), + SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1), + SENSOR_ATTR(temp2_crit, 0644, show_temp_crit, store_temp_crit, 1), + SENSOR_ATTR(temp2_crit_hyst, 0444, show_temp_crit_hyst, NULL, 1), + SENSOR_ATTR(temp2_fault, 0444, show_status, NULL, + TMP401_STATUS_REMOTE_OPEN), + SENSOR_ATTR(temp2_min_alarm, 0444, show_status, NULL, + TMP401_STATUS_REMOTE_LOW), + SENSOR_ATTR(temp2_max_alarm, 0444, show_status, NULL, + TMP401_STATUS_REMOTE_HIGH), + SENSOR_ATTR(temp2_crit_alarm, 0444, show_status, NULL, + TMP401_STATUS_REMOTE_CRIT), +}; + +/* + * Begin non sysfs callback code (aka Real code) + */ + +static void tmp401_init_client(struct i2c_client *client) +{ + int config, config_orig; + + /* Set the conversion rate to 2 Hz */ + i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5); + + /* Start conversions (disable shutdown if necessary) */ + config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); + if (config < 0) { + dev_warn(&client->dev, "Initialization failed!\n"); + return; + } + + config_orig = config; + config &= ~TMP401_CONFIG_SHUTDOWN; + + if (config != config_orig) + i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config); +} + +static int tmp401_detect(struct i2c_client *client, int kind, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + /* Detect and identify the chip */ + if (kind <= 0) { + u8 reg; + + reg = i2c_smbus_read_byte_data(client, + TMP401_MANUFACTURER_ID_REG); + if (reg != TMP401_MANUFACTURER_ID) + return -ENODEV; + + reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG); + if (reg != TMP401_DEVICE_ID) + return -ENODEV; + + reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); + if (reg & 0x1b) + return -ENODEV; + + reg = i2c_smbus_read_byte_data(client, + TMP401_CONVERSION_RATE_READ); + if (reg > 15) + return -ENODEV; + } + strlcpy(info->type, "tmp401", I2C_NAME_SIZE); + + return 0; +} + +static int tmp401_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int i, err = 0; + struct tmp401_data *data; + + data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* Initialize the TMP401 chip */ + tmp401_init_client(client); + + /* Register sysfs hooks */ + for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) { + err = device_create_file(&client->dev, + &tmp401_attr[i].dev_attr); + if (err) + goto exit_remove; + } + + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + data->hwmon_dev = NULL; + goto exit_remove; + } + + dev_info(&client->dev, "Detected TI TMP401 chip\n"); + + return 0; + +exit_remove: + tmp401_remove(client); /* will also free data for us */ + return err; +} + +static int tmp401_remove(struct i2c_client *client) +{ + struct tmp401_data *data = i2c_get_clientdata(client); + int i; + + if (data->hwmon_dev) + hwmon_device_unregister(data->hwmon_dev); + + for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) + device_remove_file(&client->dev, &tmp401_attr[i].dev_attr); + + kfree(data); + return 0; +} + +static struct tmp401_data *tmp401_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct tmp401_data *data = i2c_get_clientdata(client); + int i; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { + data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS); + data->config = i2c_smbus_read_byte_data(client, + TMP401_CONFIG_READ); + for (i = 0; i < 2; i++) { + /* High byte must be read first immediately followed + by the low byte */ + data->temp[i] = i2c_smbus_read_byte_data(client, + TMP401_TEMP_MSB[i]) << 8; + data->temp[i] |= i2c_smbus_read_byte_data(client, + TMP401_TEMP_LSB[i]); + data->temp_low[i] = i2c_smbus_read_byte_data(client, + TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8; + data->temp_low[i] |= i2c_smbus_read_byte_data(client, + TMP401_TEMP_LOW_LIMIT_LSB[i]); + data->temp_high[i] = i2c_smbus_read_byte_data(client, + TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8; + data->temp_high[i] |= i2c_smbus_read_byte_data(client, + TMP401_TEMP_HIGH_LIMIT_LSB[i]); + data->temp_crit[i] = i2c_smbus_read_byte_data(client, + TMP401_TEMP_CRIT_LIMIT[i]); + } + + data->temp_crit_hyst = i2c_smbus_read_byte_data(client, + TMP401_TEMP_CRIT_HYST); + + data->last_updated = jiffies; + data->valid = 1; + } + + mutex_unlock(&data->update_lock); + + return data; +} + +static int __init tmp401_init(void) +{ + return i2c_add_driver(&tmp401_driver); +} + +static void __exit tmp401_exit(void) +{ + i2c_del_driver(&tmp401_driver); +} + +MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); +MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver"); +MODULE_LICENSE("GPL"); + +module_init(tmp401_init); +module_exit(tmp401_exit); |