diff options
Diffstat (limited to 'drivers/hwmon/adt7410.c')
| -rw-r--r-- | drivers/hwmon/adt7410.c | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/drivers/hwmon/adt7410.c b/drivers/hwmon/adt7410.c new file mode 100644 index 00000000000..030c8d7c33a --- /dev/null +++ b/drivers/hwmon/adt7410.c @@ -0,0 +1,464 @@ +/* + * adt7410.c - Part of lm_sensors, Linux kernel modules for hardware + * monitoring + * This driver handles the ADT7410 and compatible digital temperature sensors. + * Hartmut Knaack <knaack.h@gmx.de> 2012-07-22 + * based on lm75.c by Frodo Looijaard <frodol@dds.nl> + * and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.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. + */ + +#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/delay.h> + +/* + * ADT7410 registers definition + */ + +#define ADT7410_TEMPERATURE 0 +#define ADT7410_STATUS 2 +#define ADT7410_CONFIG 3 +#define ADT7410_T_ALARM_HIGH 4 +#define ADT7410_T_ALARM_LOW 6 +#define ADT7410_T_CRIT 8 +#define ADT7410_T_HYST 0xA + +/* + * ADT7410 status + */ +#define ADT7410_STAT_T_LOW (1 << 4) +#define ADT7410_STAT_T_HIGH (1 << 5) +#define ADT7410_STAT_T_CRIT (1 << 6) +#define ADT7410_STAT_NOT_RDY (1 << 7) + +/* + * ADT7410 config + */ +#define ADT7410_FAULT_QUEUE_MASK (1 << 0 | 1 << 1) +#define ADT7410_CT_POLARITY (1 << 2) +#define ADT7410_INT_POLARITY (1 << 3) +#define ADT7410_EVENT_MODE (1 << 4) +#define ADT7410_MODE_MASK (1 << 5 | 1 << 6) +#define ADT7410_FULL (0 << 5 | 0 << 6) +#define ADT7410_PD (1 << 5 | 1 << 6) +#define ADT7410_RESOLUTION (1 << 7) + +/* + * ADT7410 masks + */ +#define ADT7410_T13_VALUE_MASK 0xFFF8 +#define ADT7410_T_HYST_MASK 0xF + +/* straight from the datasheet */ +#define ADT7410_TEMP_MIN (-55000) +#define ADT7410_TEMP_MAX 150000 + +enum adt7410_type { /* keep sorted in alphabetical order */ + adt7410, +}; + +/* Addresses scanned */ +static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, + I2C_CLIENT_END }; + +static const u8 ADT7410_REG_TEMP[4] = { + ADT7410_TEMPERATURE, /* input */ + ADT7410_T_ALARM_HIGH, /* high */ + ADT7410_T_ALARM_LOW, /* low */ + ADT7410_T_CRIT, /* critical */ +}; + +/* Each client has this additional data */ +struct adt7410_data { + struct device *hwmon_dev; + struct mutex update_lock; + u8 config; + u8 oldconfig; + bool valid; /* true if registers valid */ + unsigned long last_updated; /* In jiffies */ + s16 temp[4]; /* Register values, + 0 = input + 1 = high + 2 = low + 3 = critical */ + u8 hyst; /* hysteresis offset */ +}; + +/* + * adt7410 register access by I2C + */ +static int adt7410_temp_ready(struct i2c_client *client) +{ + int i, status; + + for (i = 0; i < 6; i++) { + status = i2c_smbus_read_byte_data(client, ADT7410_STATUS); + if (status < 0) + return status; + if (!(status & ADT7410_STAT_NOT_RDY)) + return 0; + msleep(60); + } + return -ETIMEDOUT; +} + +static struct adt7410_data *adt7410_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct adt7410_data *data = i2c_get_clientdata(client); + struct adt7410_data *ret = data; + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ + HZ / 2) + || !data->valid) { + int i, status; + + dev_dbg(&client->dev, "Starting update\n"); + + status = adt7410_temp_ready(client); /* check for new value */ + if (unlikely(status)) { + ret = ERR_PTR(status); + goto abort; + } + for (i = 0; i < ARRAY_SIZE(data->temp); i++) { + status = i2c_smbus_read_word_swapped(client, + ADT7410_REG_TEMP[i]); + if (unlikely(status < 0)) { + dev_dbg(dev, + "Failed to read value: reg %d, error %d\n", + ADT7410_REG_TEMP[i], status); + ret = ERR_PTR(status); + goto abort; + } + data->temp[i] = status; + } + status = i2c_smbus_read_byte_data(client, ADT7410_T_HYST); + if (unlikely(status < 0)) { + dev_dbg(dev, + "Failed to read value: reg %d, error %d\n", + ADT7410_T_HYST, status); + ret = ERR_PTR(status); + goto abort; + } + data->hyst = status; + data->last_updated = jiffies; + data->valid = true; + } + +abort: + mutex_unlock(&data->update_lock); + return ret; +} + +static s16 ADT7410_TEMP_TO_REG(long temp) +{ + return DIV_ROUND_CLOSEST(SENSORS_LIMIT(temp, ADT7410_TEMP_MIN, + ADT7410_TEMP_MAX) * 128, 1000); +} + +static int ADT7410_REG_TO_TEMP(struct adt7410_data *data, s16 reg) +{ + /* in 13 bit mode, bits 0-2 are status flags - mask them out */ + if (!(data->config & ADT7410_RESOLUTION)) + reg &= ADT7410_T13_VALUE_MASK; + /* + * temperature is stored in twos complement format, in steps of + * 1/128°C + */ + return DIV_ROUND_CLOSEST(reg * 1000, 128); +} + +/*-----------------------------------------------------------------------*/ + +/* sysfs attributes for hwmon */ + +static ssize_t adt7410_show_temp(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct adt7410_data *data = adt7410_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", ADT7410_REG_TO_TEMP(data, + data->temp[attr->index])); +} + +static ssize_t adt7410_set_temp(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct i2c_client *client = to_i2c_client(dev); + struct adt7410_data *data = i2c_get_clientdata(client); + int nr = attr->index; + long temp; + int ret; + + ret = kstrtol(buf, 10, &temp); + if (ret) + return ret; + + mutex_lock(&data->update_lock); + data->temp[nr] = ADT7410_TEMP_TO_REG(temp); + ret = i2c_smbus_write_word_swapped(client, ADT7410_REG_TEMP[nr], + data->temp[nr]); + if (ret) + count = ret; + mutex_unlock(&data->update_lock); + return count; +} + +static ssize_t adt7410_show_t_hyst(struct device *dev, + struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct adt7410_data *data; + int nr = attr->index; + int hyst; + + data = adt7410_update_device(dev); + if (IS_ERR(data)) + return PTR_ERR(data); + hyst = (data->hyst & ADT7410_T_HYST_MASK) * 1000; + + /* + * hysteresis is stored as a 4 bit offset in the device, convert it + * to an absolute value + */ + if (nr == 2) /* min has positive offset, others have negative */ + hyst = -hyst; + return sprintf(buf, "%d\n", + ADT7410_REG_TO_TEMP(data, data->temp[nr]) - hyst); +} + +static ssize_t adt7410_set_t_hyst(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct adt7410_data *data = i2c_get_clientdata(client); + int limit, ret; + long hyst; + + ret = kstrtol(buf, 10, &hyst); + if (ret) + return ret; + /* convert absolute hysteresis value to a 4 bit delta value */ + limit = ADT7410_REG_TO_TEMP(data, data->temp[1]); + hyst = SENSORS_LIMIT(hyst, ADT7410_TEMP_MIN, ADT7410_TEMP_MAX); + data->hyst = SENSORS_LIMIT(DIV_ROUND_CLOSEST(limit - hyst, 1000), + 0, ADT7410_T_HYST_MASK); + ret = i2c_smbus_write_byte_data(client, ADT7410_T_HYST, data->hyst); + if (ret) + return ret; + + return count; +} + +static ssize_t adt7410_show_alarm(struct device *dev, + struct device_attribute *da, + char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + int ret; + + ret = i2c_smbus_read_byte_data(client, ADT7410_STATUS); + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", !!(ret & attr->index)); +} + +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7410_show_temp, NULL, 0); +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, + adt7410_show_temp, adt7410_set_temp, 1); +static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, + adt7410_show_temp, adt7410_set_temp, 2); +static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, + adt7410_show_temp, adt7410_set_temp, 3); +static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, + adt7410_show_t_hyst, adt7410_set_t_hyst, 1); +static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO, + adt7410_show_t_hyst, NULL, 2); +static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, + adt7410_show_t_hyst, NULL, 3); +static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7410_show_alarm, + NULL, ADT7410_STAT_T_LOW); +static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7410_show_alarm, + NULL, ADT7410_STAT_T_HIGH); +static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7410_show_alarm, + NULL, ADT7410_STAT_T_CRIT); + +static struct attribute *adt7410_attributes[] = { + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_temp1_max.dev_attr.attr, + &sensor_dev_attr_temp1_min.dev_attr.attr, + &sensor_dev_attr_temp1_crit.dev_attr.attr, + &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, + &sensor_dev_attr_temp1_min_hyst.dev_attr.attr, + &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, + &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, + &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, + NULL +}; + +static const struct attribute_group adt7410_group = { + .attrs = adt7410_attributes, +}; + +/*-----------------------------------------------------------------------*/ + +/* device probe and removal */ + +static int adt7410_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct adt7410_data *data; + int ret; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) + return -ENODEV; + + data = devm_kzalloc(&client->dev, sizeof(struct adt7410_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* configure as specified */ + ret = i2c_smbus_read_byte_data(client, ADT7410_CONFIG); + if (ret < 0) { + dev_dbg(&client->dev, "Can't read config? %d\n", ret); + return ret; + } + data->oldconfig = ret; + /* + * Set to 16 bit resolution, continous conversion and comparator mode. + */ + data->config = ret | ADT7410_FULL | ADT7410_RESOLUTION | + ADT7410_EVENT_MODE; + if (data->config != data->oldconfig) { + ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, + data->config); + if (ret) + return ret; + } + dev_dbg(&client->dev, "Config %02x\n", data->config); + + /* Register sysfs hooks */ + ret = sysfs_create_group(&client->dev.kobj, &adt7410_group); + if (ret) + goto exit_restore; + + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + ret = PTR_ERR(data->hwmon_dev); + goto exit_remove; + } + + dev_info(&client->dev, "sensor '%s'\n", client->name); + + return 0; + +exit_remove: + sysfs_remove_group(&client->dev.kobj, &adt7410_group); +exit_restore: + i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->oldconfig); + return ret; +} + +static int adt7410_remove(struct i2c_client *client) +{ + struct adt7410_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &adt7410_group); + if (data->oldconfig != data->config) + i2c_smbus_write_byte_data(client, ADT7410_CONFIG, + data->oldconfig); + return 0; +} + +static const struct i2c_device_id adt7410_ids[] = { + { "adt7410", adt7410, }, + { /* LIST END */ } +}; +MODULE_DEVICE_TABLE(i2c, adt7410_ids); + +#ifdef CONFIG_PM +static int adt7410_suspend(struct device *dev) +{ + int ret; + struct i2c_client *client = to_i2c_client(dev); + struct adt7410_data *data = i2c_get_clientdata(client); + + ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, + data->config | ADT7410_PD); + return ret; +} + +static int adt7410_resume(struct device *dev) +{ + int ret; + struct i2c_client *client = to_i2c_client(dev); + struct adt7410_data *data = i2c_get_clientdata(client); + + ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->config); + return ret; +} + +static const struct dev_pm_ops adt7410_dev_pm_ops = { + .suspend = adt7410_suspend, + .resume = adt7410_resume, +}; +#define ADT7410_DEV_PM_OPS (&adt7410_dev_pm_ops) +#else +#define ADT7410_DEV_PM_OPS NULL +#endif /* CONFIG_PM */ + +static struct i2c_driver adt7410_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "adt7410", + .pm = ADT7410_DEV_PM_OPS, + }, + .probe = adt7410_probe, + .remove = adt7410_remove, + .id_table = adt7410_ids, + .address_list = normal_i2c, +}; + +module_i2c_driver(adt7410_driver); + +MODULE_AUTHOR("Hartmut Knaack"); +MODULE_DESCRIPTION("ADT7410 driver"); +MODULE_LICENSE("GPL"); |