The driver supports the Maxim MAX31790. Signed-off-by: Il Han <corone.il.han@xxxxxxxxx> --- Documentation/hwmon/max31790 | 37 +++ drivers/hwmon/Kconfig | 10 + drivers/hwmon/Makefile | 1 + drivers/hwmon/max31790.c | 603 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 651 insertions(+) create mode 100644 Documentation/hwmon/max31790 create mode 100644 drivers/hwmon/max31790.c diff --git a/Documentation/hwmon/max31790 b/Documentation/hwmon/max31790 new file mode 100644 index 0000000..855e624 --- /dev/null +++ b/Documentation/hwmon/max31790 @@ -0,0 +1,37 @@ +Kernel driver max31790 +====================== + +Supported chips: + * Maxim MAX31790 + Prefix: 'max31790' + Addresses scanned: - + Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf + +Author: Il Han <corone.il.han@xxxxxxxxx> + + +Description +----------- + +This driver implements support for the Maxim MAX31790 chip. + +The MAX31790 controls the speeds of up to six fans using six independent +PWM outputs. The desired fan speeds (or PWM duty cycles) are written +through the I2C interface. The outputs drive "4-wire" fans directly, +or can be used to modulate the fan's power terminals using an external +pass transistor. + +Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%) +monitoring and control of fan RPM as well as detection of fan failure. +Six pins are dedicated tachometer inputs. Any of the six PWM outputs can +also be configured to serve as tachometer inputs. + + +Sysfs entries +------------- + +fan[1-12]_input RO fan tachometer speed in RPM +fan[1-12]_fault RO fan experienced fault +fan[1-6]_target RW desired fan speed in RPM +pwm[1-6]_enable RW regulator mode, 0=disabled, 1=manual mode, 2=rpm mode +pwm[1-6] RW fan target duty cycle (0-255) diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 7c65b73..39775f9 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -840,6 +840,16 @@ 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 6-Channel PWM-Output + Fan RPM Controller. + + 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..d9b0003 --- /dev/null +++ b/drivers/hwmon/max31790.c @@ -0,0 +1,603 @@ +/* + * 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_STATUS2 0x10 +#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 +#define MAX31790_FAN_CFG_TACH_INPUT 0x01 + +/* Fan Dynamics register bits */ +#define MAX31790_FAN_DYN_SR_SHIFT 5 +#define MAX31790_FAN_DYN_SR_MASK 0xE0 +#define SR_FROM_REG(reg) (((reg) & MAX31790_FAN_DYN_SR_MASK) \ + >> MAX31790_FAN_DYN_SR_SHIFT) + +#define FAN_RPM_MIN 120 +#define FAN_RPM_MAX 7864320 + +#define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \ + ((60 * (sr) * 8192) / ((reg) >> 4)) : \ + FAN_RPM_MAX) +#define RPM_TO_REG(rpm, sr) ((60 * (sr) * 8192) / ((rpm) * 2)) + +#define NR_CHANNEL 6 + +/* + * 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]; + u16 fault_status; + u16 tach[NR_CHANNEL * 2]; + 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; + struct max31790_data *ret = data; + int i; + int rv; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { + rv = i2c_smbus_read_byte_data(client, + MAX31790_REG_FAN_FAULT_STATUS1); + if (rv < 0) + goto abort; + data->fault_status = rv & 0x3F; + + rv = i2c_smbus_read_byte_data(client, + MAX31790_REG_FAN_FAULT_STATUS2); + if (rv < 0) + goto abort; + data->fault_status |= (rv & 0x3F) << 6; + + for (i = 0; i < NR_CHANNEL; i++) { + rv = i2c_smbus_read_word_swapped(client, + MAX31790_REG_TACH_COUNT(i)); + if (rv < 0) + goto abort; + data->tach[i] = rv; + + if (data->fan_config[i] + & MAX31790_FAN_CFG_TACH_INPUT) { + rv = i2c_smbus_read_word_swapped(client, + MAX31790_REG_TACH_COUNT(NR_CHANNEL + + i)); + if (rv < 0) + goto abort; + data->tach[NR_CHANNEL + i] = rv; + } else { + rv = i2c_smbus_read_word_swapped(client, + MAX31790_REG_PWMOUT(i)); + if (rv < 0) + goto abort; + data->pwm[i] = rv; + + rv = i2c_smbus_read_word_swapped(client, + MAX31790_REG_TARGET_COUNT(i)); + if (rv < 0) + goto abort; + data->target_count[i] = rv; + } + } + + data->last_updated = jiffies; + data->valid = true; + } + goto done; + +abort: + data->valid = false; + ret = ERR_PTR(rv); + +done: + mutex_unlock(&data->update_lock); + + return ret; +} + +static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 }; + +static u8 get_tach_period(u8 fan_dynamics) +{ + return tach_period[SR_FROM_REG(fan_dynamics)]; +} + +static u8 bits_for_tach_period(int rpm) +{ + u8 bits; + + if (rpm < 500) + bits = 0x0; + else if (rpm < 1000) + bits = 0x1; + else if (rpm < 2000) + bits = 0x2; + else if (rpm < 4000) + bits = 0x3; + else if (rpm < 8000) + bits = 0x4; + else + bits = 0x5; + + return bits; +} + +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_tach_period(data->fan_dynamics[attr->index]); + int rpm; + + if (IS_ERR(data)) + return PTR_ERR(data); + + 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_tach_period(data->fan_dynamics[attr->index]); + int rpm; + + if (IS_ERR(data)) + return PTR_ERR(data); + + 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); + u8 bits; + 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); + bits = bits_for_tach_period(rpm); + data->fan_dynamics[attr->index] = + ((data->fan_dynamics[attr->index] + & ~MAX31790_FAN_DYN_SR_MASK) + | (bits << MAX31790_FAN_DYN_SR_SHIFT)); + err = i2c_smbus_write_byte_data(client, + MAX31790_REG_FAN_DYNAMICS(attr->index), + data->fan_dynamics[attr->index]); + + if (err < 0) { + mutex_unlock(&data->update_lock); + return err; + } + + sr = get_tach_period(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] = target_count << 5; + + err = i2c_smbus_write_word_swapped(client, + MAX31790_REG_TARGET_COUNT(attr->index), + data->target_count[attr->index]); + + mutex_unlock(&data->update_lock); + + if (err < 0) + return err; + + 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; + + if (IS_ERR(data)) + return PTR_ERR(data); + + 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; + + if (pwm > 255) + return -EINVAL; + + mutex_lock(&data->update_lock); + + data->pwm[attr->index] = pwm << 8; + err = i2c_smbus_write_word_swapped(client, + MAX31790_REG_PWMOUT(attr->index), + data->pwm[attr->index]); + + mutex_unlock(&data->update_lock); + + if (err < 0) + return err; + + 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 (IS_ERR(data)) + return PTR_ERR(data); + + 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); + + err = i2c_smbus_write_byte_data(client, + MAX31790_REG_FAN_CONFIG(attr->index), + data->fan_config[attr->index]); + + mutex_unlock(&data->update_lock); + + if (err < 0) + return err; + + 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; + + if (IS_ERR(data)) + return PTR_ERR(data); + + fault = !!(data->fault_status & (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_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 SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, get_fan, NULL, 6); +static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, get_fan, NULL, 7); +static SENSOR_DEVICE_ATTR(fan9_input, S_IRUGO, get_fan, NULL, 8); +static SENSOR_DEVICE_ATTR(fan10_input, S_IRUGO, get_fan, NULL, 9); +static SENSOR_DEVICE_ATTR(fan11_input, S_IRUGO, get_fan, NULL, 10); +static SENSOR_DEVICE_ATTR(fan12_input, S_IRUGO, get_fan, NULL, 11); + +static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, get_fan_fault, NULL, 6); +static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, get_fan_fault, NULL, 7); +static SENSOR_DEVICE_ATTR(fan9_fault, S_IRUGO, get_fan_fault, NULL, 8); +static SENSOR_DEVICE_ATTR(fan10_fault, S_IRUGO, get_fan_fault, NULL, 9); +static SENSOR_DEVICE_ATTR(fan11_fault, S_IRUGO, get_fan_fault, NULL, 10); +static SENSOR_DEVICE_ATTR(fan12_fault, S_IRUGO, get_fan_fault, NULL, 11); + +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 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_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, + + &sensor_dev_attr_fan7_input.dev_attr.attr, + &sensor_dev_attr_fan8_input.dev_attr.attr, + &sensor_dev_attr_fan9_input.dev_attr.attr, + &sensor_dev_attr_fan10_input.dev_attr.attr, + &sensor_dev_attr_fan11_input.dev_attr.attr, + &sensor_dev_attr_fan12_input.dev_attr.attr, + + &sensor_dev_attr_fan7_fault.dev_attr.attr, + &sensor_dev_attr_fan8_fault.dev_attr.attr, + &sensor_dev_attr_fan9_fault.dev_attr.attr, + &sensor_dev_attr_fan10_fault.dev_attr.attr, + &sensor_dev_attr_fan11_fault.dev_attr.attr, + &sensor_dev_attr_fan12_fault.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, + NULL +}; + +static umode_t max31790_attrs_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct max31790_data *data = dev_get_drvdata(dev); + struct device_attribute *devattr = + container_of(a, struct device_attribute, attr); + int index = to_sensor_dev_attr(devattr)->index % NR_CHANNEL; + u8 fan_config; + + fan_config = data->fan_config[index]; + + if (n >= NR_CHANNEL * 2 && n < NR_CHANNEL * 4 && + !(fan_config & MAX31790_FAN_CFG_TACH_INPUT)) + return 0; + if (n >= NR_CHANNEL * 4 && (fan_config & MAX31790_FAN_CFG_TACH_INPUT)) + return 0; + + return a->mode; +} + +static const struct attribute_group max31790_group = { + .attrs = max31790_attrs, + .is_visible = max31790_attrs_visible, +}; +__ATTRIBUTE_GROUPS(max31790); + +static int max31790_init_client(struct i2c_client *client, + struct max31790_data *data) +{ + int i, rv; + + for (i = 0; i < NR_CHANNEL; i++) { + rv = i2c_smbus_read_byte_data(client, + MAX31790_REG_FAN_CONFIG(i)); + if (rv < 0) + return rv; + data->fan_config[i] = rv; + + rv = i2c_smbus_read_byte_data(client, + MAX31790_REG_FAN_DYNAMICS(i)); + if (rv < 0) + return rv; + data->fan_dynamics[i] = rv; + } + + 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(client, data); + 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
