The driver supports the Maxim MAX31790. Signed-off-by: Il Han <corone.il.han@xxxxxxxxx> --- drivers/hwmon/Kconfig | 9 + drivers/hwmon/Makefile | 1 + drivers/hwmon/max31790.c | 437 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 447 insertions(+) create mode 100644 drivers/hwmon/max31790.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 7c65b73..fcd1c93 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -840,6 +840,15 @@ config SENSORS_MAX6697 This driver can also be built as a module. If so, the module will be called max6697. +config SENSORS_MAX31790 + tristate "Maxim MAX31790 sensor chip" + depends on I2C + help + If you say yes here you get support for the MAX31790 sensor chips. + + This driver can also be built as a module. If so, the module + will be called max31790. + config SENSORS_HTU21 tristate "Measurement Specialties HTU21D humidity/temperature sensors" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 9e0f3dd..01855ee 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -115,6 +115,7 @@ obj-$(CONFIG_SENSORS_MAX6639) += max6639.o obj-$(CONFIG_SENSORS_MAX6642) += max6642.o obj-$(CONFIG_SENSORS_MAX6650) += max6650.o obj-$(CONFIG_SENSORS_MAX6697) += max6697.o +obj-$(CONFIG_SENSORS_MAX31790) += max31790.o obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c new file mode 100644 index 0000000..39e5162 --- /dev/null +++ b/drivers/hwmon/max31790.c @@ -0,0 +1,437 @@ +/* + * max31790.c - Part of lm_sensors, Linux kernel modules for hardware + * monitoring. + * + * (C) 2015 by Il Han <corone.il.han@xxxxxxxxx> + * + * 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. + */ + +#include <linux/err.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/jiffies.h> +#include <linux/module.h> +#include <linux/slab.h> + +/* MAX31790 registers */ +#define MAX31790_REG_GLOBAL_CONFIG 0x00 +#define MAX31790_REG_FAN_CONFIG(ch) (0x02 + (ch)) +#define MAX31790_REG_FAN_DYNAMICS(ch) (0x08 + (ch)) +#define MAX31790_REG_FAN_FAULT_STATUS1 0x11 +#define MAX31790_REG_TACH_COUNT(ch) (0x18 + (ch) * 2) +#define MAX31790_REG_PWM_DUTY_CYCLE(ch) (0x30 + (ch) * 2) +#define MAX31790_REG_PWMOUT(ch) (0x40 + (ch) * 2) +#define MAX31790_REG_TARGET_COUNT(ch) (0x50 + (ch) * 2) + +/* Fan Config register bits */ +#define MAX31790_FAN_CFG_RPM_MODE 0x80 +#define MAX31790_FAN_CFG_TACH_INPUT_EN 0x08 + +/* Fan Dynamics register bits */ +#define SR_FROM_REG(reg) (((reg) >> 5) & 0x7) + +#define RPM_FROM_REG(reg, sr) ((60 * sr * 8192) / (reg >> 4)) +#define RPM_TO_REG(rpm, sr) ((60 * sr * 8192) / (rpm * 2)) + +#define NR_CHANNEL 6 + +#define FAN_RPM_MIN 120 +#define FAN_RPM_MAX 7864320 + +/* + * Client data (each client gets its own) + */ +struct max31790_data { + struct i2c_client *client; + struct mutex update_lock; + bool valid; /* zero until following fields are valid */ + unsigned long last_updated; /* in jiffies */ + + /* register values */ + u8 fan_config[NR_CHANNEL]; + u8 fan_dynamics[NR_CHANNEL]; + u8 fault_status1; + u16 tach[NR_CHANNEL]; + u16 pwm[NR_CHANNEL]; + u16 target_count[NR_CHANNEL]; +}; + +static struct max31790_data *max31790_update_device(struct device *dev) +{ + struct max31790_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + int i; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { + data->fault_status1 = i2c_smbus_read_byte_data(client, + MAX31790_REG_FAN_FAULT_STATUS1); + for (i = 0; i < NR_CHANNEL; i++) { + data->tach[i] = i2c_smbus_read_word_swapped(client, + MAX31790_REG_TACH_COUNT(i)); + data->pwm[i] = i2c_smbus_read_word_swapped(client, + MAX31790_REG_PWMOUT(i)); + data->target_count[i] = + i2c_smbus_read_word_swapped(client, + MAX31790_REG_TARGET_COUNT(i)); + } + + data->last_updated = jiffies; + data->valid = 1; + } + + mutex_unlock(&data->update_lock); + + return data; +} + +static const u8 sr[8] = { 1, 2, 4, 8, 16, 32, 32, 32 }; + +u8 get_speed_range(u8 fan_dynamics) +{ + return sr[SR_FROM_REG(fan_dynamics)]; +} + +static ssize_t get_fan(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct max31790_data *data = max31790_update_device(dev); + int sr = get_speed_range(data->fan_dynamics[attr->index]); + int rpm; + + rpm = RPM_FROM_REG(data->tach[attr->index], sr); + + return sprintf(buf, "%d\n", rpm); +} + +static ssize_t get_fan_target(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct max31790_data *data = max31790_update_device(dev); + int sr = get_speed_range(data->fan_dynamics[attr->index]); + int rpm; + + rpm = RPM_FROM_REG(data->target_count[attr->index], sr); + + return sprintf(buf, "%d\n", rpm); +} + +static ssize_t set_fan_target(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct i2c_client *client = to_i2c_client(dev); + struct max31790_data *data = i2c_get_clientdata(client); + int sr; + int target_count; + unsigned long rpm; + int err; + + err = kstrtoul(buf, 10, &rpm); + if (err) + return err; + + mutex_lock(&data->update_lock); + + rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX); + sr = get_speed_range(data->fan_dynamics[attr->index]); + target_count = RPM_TO_REG(rpm, sr); + target_count = clamp_val(target_count, 0x1, 0x7FF); + + data->target_count[attr->index] = (u16)target_count << 5; + + i2c_smbus_write_word_swapped(client, + MAX31790_REG_TARGET_COUNT(attr->index), + data->target_count[attr->index]); + + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t get_pwm(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct max31790_data *data = max31790_update_device(dev); + int pwm; + + pwm = data->pwm[attr->index] >> 8; + + return sprintf(buf, "%d\n", pwm); +} + +static ssize_t set_pwm(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct i2c_client *client = to_i2c_client(dev); + struct max31790_data *data = i2c_get_clientdata(client); + unsigned long pwm; + int err; + + err = kstrtoul(buf, 10, &pwm); + if (err) + return err; + + pwm = clamp_val(pwm, 0, 255); + + mutex_lock(&data->update_lock); + + data->pwm[attr->index] = (u16)pwm << 8; + i2c_smbus_write_word_swapped(client, + MAX31790_REG_PWMOUT(attr->index), + data->pwm[attr->index]); + + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t get_pwm_enable(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct max31790_data *data = max31790_update_device(dev); + int mode; + + if (data->fan_config[attr->index] & MAX31790_FAN_CFG_RPM_MODE) + mode = 2; + else if (data->fan_config[attr->index] & MAX31790_FAN_CFG_TACH_INPUT_EN) + mode = 1; + else + mode = 0; + + return sprintf(buf, "%d\n", mode); +} + +static ssize_t set_pwm_enable(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct i2c_client *client = to_i2c_client(dev); + struct max31790_data *data = i2c_get_clientdata(client); + unsigned long mode; + int err; + + err = kstrtoul(buf, 10, &mode); + if (err) + return err; + + switch (mode) { + case 0: + data->fan_config[attr->index] = + data->fan_config[attr->index] + & ~(MAX31790_FAN_CFG_TACH_INPUT_EN + | MAX31790_FAN_CFG_RPM_MODE); + break; + case 1: + data->fan_config[attr->index] = + (data->fan_config[attr->index] + | MAX31790_FAN_CFG_TACH_INPUT_EN) + & ~MAX31790_FAN_CFG_RPM_MODE; + break; + case 2: + data->fan_config[attr->index] = + (data->fan_config[attr->index] + | MAX31790_FAN_CFG_TACH_INPUT_EN) + | MAX31790_FAN_CFG_RPM_MODE; + break; + default: + return -EINVAL; + } + + mutex_lock(&data->update_lock); + + i2c_smbus_write_byte_data(client, + MAX31790_REG_FAN_CONFIG(attr->index), + data->fan_config[attr->index]); + + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t get_fan_fault(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct max31790_data *data = max31790_update_device(dev); + int fault; + + fault = !!(data->fault_status1 & (1 << attr->index)); + + return sprintf(buf, "%d\n", fault); +} + +static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0); +static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1); +static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2); +static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3); +static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, get_fan, NULL, 4); +static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, get_fan, NULL, 5); + +static SENSOR_DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, + get_fan_target, set_fan_target, 0); +static SENSOR_DEVICE_ATTR(fan2_target, S_IWUSR | S_IRUGO, + get_fan_target, set_fan_target, 1); +static SENSOR_DEVICE_ATTR(fan3_target, S_IWUSR | S_IRUGO, + get_fan_target, set_fan_target, 2); +static SENSOR_DEVICE_ATTR(fan4_target, S_IWUSR | S_IRUGO, + get_fan_target, set_fan_target, 3); +static SENSOR_DEVICE_ATTR(fan5_target, S_IWUSR | S_IRUGO, + get_fan_target, set_fan_target, 4); +static SENSOR_DEVICE_ATTR(fan6_target, S_IWUSR | S_IRUGO, + get_fan_target, set_fan_target, 5); + +static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 0); +static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 1); +static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 2); +static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 3); +static SENSOR_DEVICE_ATTR(pwm5, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 4); +static SENSOR_DEVICE_ATTR(pwm6, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 5); + +static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, + get_pwm_enable, set_pwm_enable, 0); +static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, + get_pwm_enable, set_pwm_enable, 1); +static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO, + get_pwm_enable, set_pwm_enable, 2); +static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO, + get_pwm_enable, set_pwm_enable, 3); +static SENSOR_DEVICE_ATTR(pwm5_enable, S_IWUSR | S_IRUGO, + get_pwm_enable, set_pwm_enable, 4); +static SENSOR_DEVICE_ATTR(pwm6_enable, S_IWUSR | S_IRUGO, + get_pwm_enable, set_pwm_enable, 5); + +static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_fault, NULL, 0); +static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, get_fan_fault, NULL, 1); +static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, get_fan_fault, NULL, 2); +static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, get_fan_fault, NULL, 3); +static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, get_fan_fault, NULL, 4); +static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, get_fan_fault, NULL, 5); + +static struct attribute *max31790_attrs[] = { + &sensor_dev_attr_fan1_input.dev_attr.attr, + &sensor_dev_attr_fan2_input.dev_attr.attr, + &sensor_dev_attr_fan3_input.dev_attr.attr, + &sensor_dev_attr_fan4_input.dev_attr.attr, + &sensor_dev_attr_fan5_input.dev_attr.attr, + &sensor_dev_attr_fan6_input.dev_attr.attr, + + &sensor_dev_attr_fan1_target.dev_attr.attr, + &sensor_dev_attr_fan2_target.dev_attr.attr, + &sensor_dev_attr_fan3_target.dev_attr.attr, + &sensor_dev_attr_fan4_target.dev_attr.attr, + &sensor_dev_attr_fan5_target.dev_attr.attr, + &sensor_dev_attr_fan6_target.dev_attr.attr, + + &sensor_dev_attr_pwm1.dev_attr.attr, + &sensor_dev_attr_pwm2.dev_attr.attr, + &sensor_dev_attr_pwm3.dev_attr.attr, + &sensor_dev_attr_pwm4.dev_attr.attr, + &sensor_dev_attr_pwm5.dev_attr.attr, + &sensor_dev_attr_pwm6.dev_attr.attr, + + &sensor_dev_attr_pwm1_enable.dev_attr.attr, + &sensor_dev_attr_pwm2_enable.dev_attr.attr, + &sensor_dev_attr_pwm3_enable.dev_attr.attr, + &sensor_dev_attr_pwm4_enable.dev_attr.attr, + &sensor_dev_attr_pwm5_enable.dev_attr.attr, + &sensor_dev_attr_pwm6_enable.dev_attr.attr, + + &sensor_dev_attr_fan1_fault.dev_attr.attr, + &sensor_dev_attr_fan2_fault.dev_attr.attr, + &sensor_dev_attr_fan3_fault.dev_attr.attr, + &sensor_dev_attr_fan4_fault.dev_attr.attr, + &sensor_dev_attr_fan5_fault.dev_attr.attr, + &sensor_dev_attr_fan6_fault.dev_attr.attr, + NULL +}; +ATTRIBUTE_GROUPS(max31790); + +static int max31790_init_client(struct max31790_data *data, + struct i2c_client *client) +{ + int i; + + for (i = 0; i < NR_CHANNEL; i++) { + data->fan_config[i] = i2c_smbus_read_byte_data(client, + MAX31790_REG_FAN_CONFIG(i)); + data->fan_dynamics[i] = i2c_smbus_read_byte_data(client, + MAX31790_REG_FAN_DYNAMICS(i)); + } + + return 0; +} + +static int max31790_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = client->adapter; + struct device *dev = &client->dev; + struct max31790_data *data; + struct device *hwmon_dev; + int err; + + if (!i2c_check_functionality(adapter, + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) + return -ENODEV; + + data = devm_kzalloc(dev, sizeof(struct max31790_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + mutex_init(&data->update_lock); + + /* + * Initialize the max31790 chip + */ + err = max31790_init_client(data, client); + if (err) + return err; + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, + client->name, data, max31790_groups); + + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct i2c_device_id max31790_id[] = { + { "max31790", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max31790_id); + +static struct i2c_driver max31790_driver = { + .class = I2C_CLASS_HWMON, + .probe = max31790_probe, + .driver = { + .name = "max31790", + }, + .id_table = max31790_id, +}; + +module_i2c_driver(max31790_driver); + +MODULE_AUTHOR("Il Han <corone.il.han@xxxxxxxxx>"); +MODULE_DESCRIPTION("MAX31790 sensor driver"); +MODULE_LICENSE("GPL"); -- 2.4.1 _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors