diff options
Diffstat (limited to 'drivers/hwmon/adt7x10.c')
| -rw-r--r-- | drivers/hwmon/adt7x10.c | 476 |
1 files changed, 476 insertions, 0 deletions
diff --git a/drivers/hwmon/adt7x10.c b/drivers/hwmon/adt7x10.c new file mode 100644 index 00000000000..84b3dfc1c1c --- /dev/null +++ b/drivers/hwmon/adt7x10.c @@ -0,0 +1,476 @@ +/* + * adt7x10.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/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/delay.h> + +#include "adt7x10.h" + +/* + * ADT7X10 status + */ +#define ADT7X10_STAT_T_LOW (1 << 4) +#define ADT7X10_STAT_T_HIGH (1 << 5) +#define ADT7X10_STAT_T_CRIT (1 << 6) +#define ADT7X10_STAT_NOT_RDY (1 << 7) + +/* + * ADT7X10 config + */ +#define ADT7X10_FAULT_QUEUE_MASK (1 << 0 | 1 << 1) +#define ADT7X10_CT_POLARITY (1 << 2) +#define ADT7X10_INT_POLARITY (1 << 3) +#define ADT7X10_EVENT_MODE (1 << 4) +#define ADT7X10_MODE_MASK (1 << 5 | 1 << 6) +#define ADT7X10_FULL (0 << 5 | 0 << 6) +#define ADT7X10_PD (1 << 5 | 1 << 6) +#define ADT7X10_RESOLUTION (1 << 7) + +/* + * ADT7X10 masks + */ +#define ADT7X10_T13_VALUE_MASK 0xFFF8 +#define ADT7X10_T_HYST_MASK 0xF + +/* straight from the datasheet */ +#define ADT7X10_TEMP_MIN (-55000) +#define ADT7X10_TEMP_MAX 150000 + +/* Each client has this additional data */ +struct adt7x10_data { + const struct adt7x10_ops *ops; + const char *name; + 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 */ +}; + +static int adt7x10_read_byte(struct device *dev, u8 reg) +{ + struct adt7x10_data *d = dev_get_drvdata(dev); + return d->ops->read_byte(dev, reg); +} + +static int adt7x10_write_byte(struct device *dev, u8 reg, u8 data) +{ + struct adt7x10_data *d = dev_get_drvdata(dev); + return d->ops->write_byte(dev, reg, data); +} + +static int adt7x10_read_word(struct device *dev, u8 reg) +{ + struct adt7x10_data *d = dev_get_drvdata(dev); + return d->ops->read_word(dev, reg); +} + +static int adt7x10_write_word(struct device *dev, u8 reg, u16 data) +{ + struct adt7x10_data *d = dev_get_drvdata(dev); + return d->ops->write_word(dev, reg, data); +} + +static const u8 ADT7X10_REG_TEMP[4] = { + ADT7X10_TEMPERATURE, /* input */ + ADT7X10_T_ALARM_HIGH, /* high */ + ADT7X10_T_ALARM_LOW, /* low */ + ADT7X10_T_CRIT, /* critical */ +}; + +static int adt7x10_temp_ready(struct device *dev) +{ + int i, status; + + for (i = 0; i < 6; i++) { + status = adt7x10_read_byte(dev, ADT7X10_STATUS); + if (status < 0) + return status; + if (!(status & ADT7X10_STAT_NOT_RDY)) + return 0; + msleep(60); + } + return -ETIMEDOUT; +} + +static int adt7x10_update_temp(struct device *dev) +{ + struct adt7x10_data *data = dev_get_drvdata(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ + HZ / 2) + || !data->valid) { + int temp; + + dev_dbg(dev, "Starting update\n"); + + ret = adt7x10_temp_ready(dev); /* check for new value */ + if (ret) + goto abort; + + temp = adt7x10_read_word(dev, ADT7X10_REG_TEMP[0]); + if (temp < 0) { + ret = temp; + dev_dbg(dev, "Failed to read value: reg %d, error %d\n", + ADT7X10_REG_TEMP[0], ret); + goto abort; + } + data->temp[0] = temp; + data->last_updated = jiffies; + data->valid = true; + } + +abort: + mutex_unlock(&data->update_lock); + return ret; +} + +static int adt7x10_fill_cache(struct device *dev) +{ + struct adt7x10_data *data = dev_get_drvdata(dev); + int ret; + int i; + + for (i = 1; i < ARRAY_SIZE(data->temp); i++) { + ret = adt7x10_read_word(dev, ADT7X10_REG_TEMP[i]); + if (ret < 0) { + dev_dbg(dev, "Failed to read value: reg %d, error %d\n", + ADT7X10_REG_TEMP[i], ret); + return ret; + } + data->temp[i] = ret; + } + + ret = adt7x10_read_byte(dev, ADT7X10_T_HYST); + if (ret < 0) { + dev_dbg(dev, "Failed to read value: reg %d, error %d\n", + ADT7X10_T_HYST, ret); + return ret; + } + data->hyst = ret; + + return 0; +} + +static s16 ADT7X10_TEMP_TO_REG(long temp) +{ + return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN, + ADT7X10_TEMP_MAX) * 128, 1000); +} + +static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg) +{ + /* in 13 bit mode, bits 0-2 are status flags - mask them out */ + if (!(data->config & ADT7X10_RESOLUTION)) + reg &= ADT7X10_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 adt7x10_show_temp(struct device *dev, + struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct adt7x10_data *data = dev_get_drvdata(dev); + + + if (attr->index == 0) { + int ret; + + ret = adt7x10_update_temp(dev); + if (ret) + return ret; + } + + return sprintf(buf, "%d\n", ADT7X10_REG_TO_TEMP(data, + data->temp[attr->index])); +} + +static ssize_t adt7x10_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 adt7x10_data *data = dev_get_drvdata(dev); + 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] = ADT7X10_TEMP_TO_REG(temp); + ret = adt7x10_write_word(dev, ADT7X10_REG_TEMP[nr], data->temp[nr]); + if (ret) + count = ret; + mutex_unlock(&data->update_lock); + return count; +} + +static ssize_t adt7x10_show_t_hyst(struct device *dev, + struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct adt7x10_data *data = dev_get_drvdata(dev); + int nr = attr->index; + int hyst; + + hyst = (data->hyst & ADT7X10_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", + ADT7X10_REG_TO_TEMP(data, data->temp[nr]) - hyst); +} + +static ssize_t adt7x10_set_t_hyst(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + struct adt7x10_data *data = dev_get_drvdata(dev); + 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 = ADT7X10_REG_TO_TEMP(data, data->temp[1]); + hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX); + data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), + 0, ADT7X10_T_HYST_MASK); + ret = adt7x10_write_byte(dev, ADT7X10_T_HYST, data->hyst); + if (ret) + return ret; + + return count; +} + +static ssize_t adt7x10_show_alarm(struct device *dev, + struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + int ret; + + ret = adt7x10_read_byte(dev, ADT7X10_STATUS); + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", !!(ret & attr->index)); +} + +static ssize_t adt7x10_show_name(struct device *dev, + struct device_attribute *da, + char *buf) +{ + struct adt7x10_data *data = dev_get_drvdata(dev); + + return sprintf(buf, "%s\n", data->name); +} + +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7x10_show_temp, NULL, 0); +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, + adt7x10_show_temp, adt7x10_set_temp, 1); +static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, + adt7x10_show_temp, adt7x10_set_temp, 2); +static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, + adt7x10_show_temp, adt7x10_set_temp, 3); +static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, + adt7x10_show_t_hyst, adt7x10_set_t_hyst, 1); +static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO, + adt7x10_show_t_hyst, NULL, 2); +static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, + adt7x10_show_t_hyst, NULL, 3); +static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7x10_show_alarm, + NULL, ADT7X10_STAT_T_LOW); +static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7x10_show_alarm, + NULL, ADT7X10_STAT_T_HIGH); +static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7x10_show_alarm, + NULL, ADT7X10_STAT_T_CRIT); +static DEVICE_ATTR(name, S_IRUGO, adt7x10_show_name, NULL); + +static struct attribute *adt7x10_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 adt7x10_group = { + .attrs = adt7x10_attributes, +}; + +int adt7x10_probe(struct device *dev, const char *name, + const struct adt7x10_ops *ops) +{ + struct adt7x10_data *data; + int ret; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->ops = ops; + data->name = name; + + dev_set_drvdata(dev, data); + mutex_init(&data->update_lock); + + /* configure as specified */ + ret = adt7x10_read_byte(dev, ADT7X10_CONFIG); + if (ret < 0) { + dev_dbg(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 = data->oldconfig; + data->config &= ~ADT7X10_MODE_MASK; + data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE; + if (data->config != data->oldconfig) { + ret = adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config); + if (ret) + return ret; + } + dev_dbg(dev, "Config %02x\n", data->config); + + ret = adt7x10_fill_cache(dev); + if (ret) + goto exit_restore; + + /* Register sysfs hooks */ + ret = sysfs_create_group(&dev->kobj, &adt7x10_group); + if (ret) + goto exit_restore; + + /* + * The I2C device will already have it's own 'name' attribute, but for + * the SPI device we need to register it. name will only be non NULL if + * the device doesn't register the 'name' attribute on its own. + */ + if (name) { + ret = device_create_file(dev, &dev_attr_name); + if (ret) + goto exit_remove; + } + + data->hwmon_dev = hwmon_device_register(dev); + if (IS_ERR(data->hwmon_dev)) { + ret = PTR_ERR(data->hwmon_dev); + goto exit_remove_name; + } + + return 0; + +exit_remove_name: + if (name) + device_remove_file(dev, &dev_attr_name); +exit_remove: + sysfs_remove_group(&dev->kobj, &adt7x10_group); +exit_restore: + adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig); + return ret; +} +EXPORT_SYMBOL_GPL(adt7x10_probe); + +int adt7x10_remove(struct device *dev) +{ + struct adt7x10_data *data = dev_get_drvdata(dev); + + hwmon_device_unregister(data->hwmon_dev); + if (data->name) + device_remove_file(dev, &dev_attr_name); + sysfs_remove_group(&dev->kobj, &adt7x10_group); + if (data->oldconfig != data->config) + adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig); + return 0; +} +EXPORT_SYMBOL_GPL(adt7x10_remove); + +#ifdef CONFIG_PM_SLEEP + +static int adt7x10_suspend(struct device *dev) +{ + struct adt7x10_data *data = dev_get_drvdata(dev); + + return adt7x10_write_byte(dev, ADT7X10_CONFIG, + data->config | ADT7X10_PD); +} + +static int adt7x10_resume(struct device *dev) +{ + struct adt7x10_data *data = dev_get_drvdata(dev); + + return adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config); +} + +SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume); +EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops); + +#endif /* CONFIG_PM_SLEEP */ + +MODULE_AUTHOR("Hartmut Knaack"); +MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code"); +MODULE_LICENSE("GPL"); |