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hwmon: Driver for Maxim MAX31790
The driver supports the Maxim MAX31790. Signed-off-by: Il Han <corone.il.han@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Il Han
Guenter Roeck
parent
25cb62b764
commit
195a4b4298
4 changed files with 651 additions and 0 deletions
37
Documentation/hwmon/max31790
Normal file
37
Documentation/hwmon/max31790
Normal file
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@ -0,0 +1,37 @@
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Kernel driver max31790
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======================
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Supported chips:
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* Maxim MAX31790
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Prefix: 'max31790'
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Addresses scanned: -
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Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf
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Author: Il Han <corone.il.han@gmail.com>
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Description
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-----------
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This driver implements support for the Maxim MAX31790 chip.
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The MAX31790 controls the speeds of up to six fans using six independent
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PWM outputs. The desired fan speeds (or PWM duty cycles) are written
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through the I2C interface. The outputs drive "4-wire" fans directly,
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or can be used to modulate the fan's power terminals using an external
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pass transistor.
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Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%)
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monitoring and control of fan RPM as well as detection of fan failure.
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Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
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also be configured to serve as tachometer inputs.
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Sysfs entries
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-------------
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fan[1-12]_input RO fan tachometer speed in RPM
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fan[1-12]_fault RO fan experienced fault
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fan[1-6]_target RW desired fan speed in RPM
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pwm[1-6]_enable RW regulator mode, 0=disabled, 1=manual mode, 2=rpm mode
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pwm[1-6] RW fan target duty cycle (0-255)
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@ -840,6 +840,16 @@ config SENSORS_MAX6697
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This driver can also be built as a module. If so, the module
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will be called max6697.
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config SENSORS_MAX31790
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tristate "Maxim MAX31790 sensor chip"
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depends on I2C
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help
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If you say yes here you get support for 6-Channel PWM-Output
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Fan RPM Controller.
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This driver can also be built as a module. If so, the module
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will be called max31790.
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config SENSORS_HTU21
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tristate "Measurement Specialties HTU21D humidity/temperature sensors"
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depends on I2C
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@ -115,6 +115,7 @@ obj-$(CONFIG_SENSORS_MAX6639) += max6639.o
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obj-$(CONFIG_SENSORS_MAX6642) += max6642.o
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obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
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obj-$(CONFIG_SENSORS_MAX6697) += max6697.o
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obj-$(CONFIG_SENSORS_MAX31790) += max31790.o
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obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
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obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o
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obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
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603
drivers/hwmon/max31790.c
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603
drivers/hwmon/max31790.c
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@ -0,0 +1,603 @@
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/*
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* max31790.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring.
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*
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* (C) 2015 by Il Han <corone.il.han@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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/* MAX31790 registers */
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#define MAX31790_REG_GLOBAL_CONFIG 0x00
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#define MAX31790_REG_FAN_CONFIG(ch) (0x02 + (ch))
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#define MAX31790_REG_FAN_DYNAMICS(ch) (0x08 + (ch))
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#define MAX31790_REG_FAN_FAULT_STATUS2 0x10
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#define MAX31790_REG_FAN_FAULT_STATUS1 0x11
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#define MAX31790_REG_TACH_COUNT(ch) (0x18 + (ch) * 2)
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#define MAX31790_REG_PWM_DUTY_CYCLE(ch) (0x30 + (ch) * 2)
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#define MAX31790_REG_PWMOUT(ch) (0x40 + (ch) * 2)
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#define MAX31790_REG_TARGET_COUNT(ch) (0x50 + (ch) * 2)
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/* Fan Config register bits */
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#define MAX31790_FAN_CFG_RPM_MODE 0x80
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#define MAX31790_FAN_CFG_TACH_INPUT_EN 0x08
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#define MAX31790_FAN_CFG_TACH_INPUT 0x01
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/* Fan Dynamics register bits */
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#define MAX31790_FAN_DYN_SR_SHIFT 5
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#define MAX31790_FAN_DYN_SR_MASK 0xE0
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#define SR_FROM_REG(reg) (((reg) & MAX31790_FAN_DYN_SR_MASK) \
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>> MAX31790_FAN_DYN_SR_SHIFT)
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#define FAN_RPM_MIN 120
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#define FAN_RPM_MAX 7864320
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#define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \
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((60 * (sr) * 8192) / ((reg) >> 4)) : \
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FAN_RPM_MAX)
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#define RPM_TO_REG(rpm, sr) ((60 * (sr) * 8192) / ((rpm) * 2))
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#define NR_CHANNEL 6
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/*
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* Client data (each client gets its own)
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*/
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struct max31790_data {
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struct i2c_client *client;
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struct mutex update_lock;
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bool valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* register values */
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u8 fan_config[NR_CHANNEL];
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u8 fan_dynamics[NR_CHANNEL];
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u16 fault_status;
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u16 tach[NR_CHANNEL * 2];
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u16 pwm[NR_CHANNEL];
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u16 target_count[NR_CHANNEL];
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};
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static struct max31790_data *max31790_update_device(struct device *dev)
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{
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struct max31790_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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struct max31790_data *ret = data;
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int i;
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int rv;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
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rv = i2c_smbus_read_byte_data(client,
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MAX31790_REG_FAN_FAULT_STATUS1);
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if (rv < 0)
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goto abort;
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data->fault_status = rv & 0x3F;
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rv = i2c_smbus_read_byte_data(client,
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MAX31790_REG_FAN_FAULT_STATUS2);
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if (rv < 0)
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goto abort;
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data->fault_status |= (rv & 0x3F) << 6;
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for (i = 0; i < NR_CHANNEL; i++) {
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rv = i2c_smbus_read_word_swapped(client,
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MAX31790_REG_TACH_COUNT(i));
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if (rv < 0)
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goto abort;
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data->tach[i] = rv;
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if (data->fan_config[i]
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& MAX31790_FAN_CFG_TACH_INPUT) {
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rv = i2c_smbus_read_word_swapped(client,
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MAX31790_REG_TACH_COUNT(NR_CHANNEL
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+ i));
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if (rv < 0)
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goto abort;
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data->tach[NR_CHANNEL + i] = rv;
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} else {
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rv = i2c_smbus_read_word_swapped(client,
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MAX31790_REG_PWMOUT(i));
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if (rv < 0)
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goto abort;
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data->pwm[i] = rv;
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rv = i2c_smbus_read_word_swapped(client,
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MAX31790_REG_TARGET_COUNT(i));
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if (rv < 0)
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goto abort;
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data->target_count[i] = rv;
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}
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}
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data->last_updated = jiffies;
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data->valid = true;
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}
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goto done;
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abort:
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data->valid = false;
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ret = ERR_PTR(rv);
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done:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
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static u8 get_tach_period(u8 fan_dynamics)
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{
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return tach_period[SR_FROM_REG(fan_dynamics)];
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}
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static u8 bits_for_tach_period(int rpm)
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{
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u8 bits;
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if (rpm < 500)
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bits = 0x0;
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else if (rpm < 1000)
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bits = 0x1;
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else if (rpm < 2000)
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bits = 0x2;
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else if (rpm < 4000)
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bits = 0x3;
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else if (rpm < 8000)
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bits = 0x4;
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else
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bits = 0x5;
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return bits;
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}
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static ssize_t get_fan(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct max31790_data *data = max31790_update_device(dev);
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int sr = get_tach_period(data->fan_dynamics[attr->index]);
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int rpm;
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if (IS_ERR(data))
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return PTR_ERR(data);
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rpm = RPM_FROM_REG(data->tach[attr->index], sr);
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return sprintf(buf, "%d\n", rpm);
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}
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static ssize_t get_fan_target(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct max31790_data *data = max31790_update_device(dev);
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int sr = get_tach_period(data->fan_dynamics[attr->index]);
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int rpm;
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if (IS_ERR(data))
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return PTR_ERR(data);
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rpm = RPM_FROM_REG(data->target_count[attr->index], sr);
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return sprintf(buf, "%d\n", rpm);
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}
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static ssize_t set_fan_target(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct max31790_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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u8 bits;
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int sr;
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int target_count;
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unsigned long rpm;
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int err;
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err = kstrtoul(buf, 10, &rpm);
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if (err)
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return err;
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mutex_lock(&data->update_lock);
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rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
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bits = bits_for_tach_period(rpm);
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data->fan_dynamics[attr->index] =
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((data->fan_dynamics[attr->index]
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& ~MAX31790_FAN_DYN_SR_MASK)
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| (bits << MAX31790_FAN_DYN_SR_SHIFT));
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err = i2c_smbus_write_byte_data(client,
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MAX31790_REG_FAN_DYNAMICS(attr->index),
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data->fan_dynamics[attr->index]);
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if (err < 0) {
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mutex_unlock(&data->update_lock);
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return err;
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}
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sr = get_tach_period(data->fan_dynamics[attr->index]);
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target_count = RPM_TO_REG(rpm, sr);
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target_count = clamp_val(target_count, 0x1, 0x7FF);
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data->target_count[attr->index] = target_count << 5;
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err = i2c_smbus_write_word_swapped(client,
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MAX31790_REG_TARGET_COUNT(attr->index),
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data->target_count[attr->index]);
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mutex_unlock(&data->update_lock);
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if (err < 0)
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return err;
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return count;
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}
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static ssize_t get_pwm(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct max31790_data *data = max31790_update_device(dev);
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int pwm;
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if (IS_ERR(data))
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return PTR_ERR(data);
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pwm = data->pwm[attr->index] >> 8;
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return sprintf(buf, "%d\n", pwm);
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}
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static ssize_t set_pwm(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct max31790_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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unsigned long pwm;
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int err;
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err = kstrtoul(buf, 10, &pwm);
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if (err)
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return err;
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if (pwm > 255)
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return -EINVAL;
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mutex_lock(&data->update_lock);
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data->pwm[attr->index] = pwm << 8;
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err = i2c_smbus_write_word_swapped(client,
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MAX31790_REG_PWMOUT(attr->index),
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data->pwm[attr->index]);
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mutex_unlock(&data->update_lock);
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if (err < 0)
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return err;
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return count;
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}
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static ssize_t get_pwm_enable(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct max31790_data *data = max31790_update_device(dev);
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int mode;
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if (IS_ERR(data))
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return PTR_ERR(data);
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if (data->fan_config[attr->index] & MAX31790_FAN_CFG_RPM_MODE)
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mode = 2;
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else if (data->fan_config[attr->index] & MAX31790_FAN_CFG_TACH_INPUT_EN)
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mode = 1;
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else
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mode = 0;
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return sprintf(buf, "%d\n", mode);
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}
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static ssize_t set_pwm_enable(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct max31790_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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unsigned long mode;
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int err;
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err = kstrtoul(buf, 10, &mode);
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if (err)
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return err;
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switch (mode) {
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case 0:
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data->fan_config[attr->index] =
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data->fan_config[attr->index]
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& ~(MAX31790_FAN_CFG_TACH_INPUT_EN
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| MAX31790_FAN_CFG_RPM_MODE);
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break;
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case 1:
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data->fan_config[attr->index] =
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(data->fan_config[attr->index]
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| MAX31790_FAN_CFG_TACH_INPUT_EN)
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& ~MAX31790_FAN_CFG_RPM_MODE;
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break;
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case 2:
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data->fan_config[attr->index] =
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data->fan_config[attr->index]
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| MAX31790_FAN_CFG_TACH_INPUT_EN
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| MAX31790_FAN_CFG_RPM_MODE;
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break;
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default:
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return -EINVAL;
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}
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mutex_lock(&data->update_lock);
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|
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err = i2c_smbus_write_byte_data(client,
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MAX31790_REG_FAN_CONFIG(attr->index),
|
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data->fan_config[attr->index]);
|
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|
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mutex_unlock(&data->update_lock);
|
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|
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if (err < 0)
|
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return err;
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|
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return count;
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}
|
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|
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static ssize_t get_fan_fault(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
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struct max31790_data *data = max31790_update_device(dev);
|
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int fault;
|
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|
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if (IS_ERR(data))
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return PTR_ERR(data);
|
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|
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fault = !!(data->fault_status & (1 << attr->index));
|
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|
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return sprintf(buf, "%d\n", fault);
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}
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static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0);
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static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1);
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static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2);
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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@gmail.com>");
|
||||
MODULE_DESCRIPTION("MAX31790 sensor driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in a new issue