467 lines
14 KiB
C
467 lines
14 KiB
C
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/*
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* A hwmon driver for the Accton as7816-64x fan
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*
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* Copyright (C) 2014 Accton Technology Corporation.
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* Brandon Chuang <brandon_chuang@accton.com.tw>
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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#include <linux/slab.h>
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#include <linux/dmi.h>
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#define DRVNAME "as7816_64x_fan"
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static struct as7816_64x_fan_data *as7816_64x_fan_update_device(struct device *dev);
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static ssize_t fan_show_value(struct device *dev, struct device_attribute *da, char *buf);
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static ssize_t set_duty_cycle(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count);
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/* fan related data, the index should match sysfs_fan_attributes
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*/
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static const u8 fan_reg[] = {
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0x80, /* fan 1-4 present status */
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0x81, /* fan 1-4 direction(0:F2B 1:B2F) */
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0x87, /* fan PWM(for all fan) */
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0x90, /* front fan 1 speed(rpm) */
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0x91, /* front fan 2 speed(rpm) */
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0x92, /* front fan 3 speed(rpm) */
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0x93, /* front fan 4 speed(rpm) */
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0x98, /* rear fan 1 speed(rpm) */
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0x99, /* rear fan 2 speed(rpm) */
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0x9A, /* rear fan 3 speed(rpm) */
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0x9B, /* rear fan 4 speed(rpm) */
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};
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/* Each client has this additional data */
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struct as7816_64x_fan_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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char valid; /* != 0 if registers are valid */
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unsigned long last_updated; /* In jiffies */
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u8 reg_val[ARRAY_SIZE(fan_reg)]; /* Register value */
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};
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enum fan_id {
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FAN1_ID,
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FAN2_ID,
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FAN3_ID,
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FAN4_ID
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};
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enum sysfs_fan_attributes {
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FAN_PRESENT_REG,
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FAN_DIRECTION_REG,
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FAN_DUTY_CYCLE_PERCENTAGE, /* Only one CPLD register to control duty cycle for all fans */
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FAN1_FRONT_SPEED_RPM,
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FAN2_FRONT_SPEED_RPM,
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FAN3_FRONT_SPEED_RPM,
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FAN4_FRONT_SPEED_RPM,
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FAN1_REAR_SPEED_RPM,
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FAN2_REAR_SPEED_RPM,
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FAN3_REAR_SPEED_RPM,
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FAN4_REAR_SPEED_RPM,
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FAN1_DIRECTION,
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FAN2_DIRECTION,
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FAN3_DIRECTION,
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FAN4_DIRECTION,
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FAN1_PRESENT,
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FAN2_PRESENT,
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FAN3_PRESENT,
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FAN4_PRESENT,
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FAN1_FAULT,
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FAN2_FAULT,
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FAN3_FAULT,
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FAN4_FAULT
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};
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/* Define attributes
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*/
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#define DECLARE_FAN_FAULT_SENSOR_DEV_ATTR(index, index2) \
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static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, fan_show_value, NULL, FAN##index##_FAULT);\
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static SENSOR_DEVICE_ATTR(fan##index2##_fault, S_IRUGO, fan_show_value, NULL, FAN##index##_FAULT)
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#define DECLARE_FAN_FAULT_ATTR(index, index2) &sensor_dev_attr_fan##index##_fault.dev_attr.attr, \
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&sensor_dev_attr_fan##index2##_fault.dev_attr.attr
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#define DECLARE_FAN_DIRECTION_SENSOR_DEV_ATTR(index) \
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static SENSOR_DEVICE_ATTR(fan##index##_direction, S_IRUGO, fan_show_value, NULL, FAN##index##_DIRECTION)
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#define DECLARE_FAN_DIRECTION_ATTR(index) &sensor_dev_attr_fan##index##_direction.dev_attr.attr
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#define DECLARE_FAN_DUTY_CYCLE_SENSOR_DEV_ATTR(index) \
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static SENSOR_DEVICE_ATTR(fan_duty_cycle_percentage, S_IWUSR | S_IRUGO, fan_show_value, set_duty_cycle, FAN_DUTY_CYCLE_PERCENTAGE);\
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static SENSOR_DEVICE_ATTR(pwm##index, S_IWUSR | S_IRUGO, fan_show_value, set_duty_cycle, FAN_DUTY_CYCLE_PERCENTAGE)
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#define DECLARE_FAN_DUTY_CYCLE_ATTR(index) &sensor_dev_attr_fan_duty_cycle_percentage.dev_attr.attr, \
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&sensor_dev_attr_pwm##index.dev_attr.attr
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#define DECLARE_FAN_PRESENT_SENSOR_DEV_ATTR(index) \
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static SENSOR_DEVICE_ATTR(fan##index##_present, S_IRUGO, fan_show_value, NULL, FAN##index##_PRESENT)
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#define DECLARE_FAN_PRESENT_ATTR(index) &sensor_dev_attr_fan##index##_present.dev_attr.attr
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#define DECLARE_FAN_SPEED_RPM_SENSOR_DEV_ATTR(index, index2) \
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static SENSOR_DEVICE_ATTR(fan##index##_front_speed_rpm, S_IRUGO, fan_show_value, NULL, FAN##index##_FRONT_SPEED_RPM);\
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static SENSOR_DEVICE_ATTR(fan##index##_rear_speed_rpm, S_IRUGO, fan_show_value, NULL, FAN##index##_REAR_SPEED_RPM);\
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static SENSOR_DEVICE_ATTR(fan##index##_input, S_IRUGO, fan_show_value, NULL, FAN##index##_FRONT_SPEED_RPM);\
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static SENSOR_DEVICE_ATTR(fan##index2##_input, S_IRUGO, fan_show_value, NULL, FAN##index##_REAR_SPEED_RPM)
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#define DECLARE_FAN_SPEED_RPM_ATTR(index, index2) &sensor_dev_attr_fan##index##_front_speed_rpm.dev_attr.attr, \
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&sensor_dev_attr_fan##index##_rear_speed_rpm.dev_attr.attr, \
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&sensor_dev_attr_fan##index##_input.dev_attr.attr, \
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&sensor_dev_attr_fan##index2##_input.dev_attr.attr
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/* 6 fan fault attributes in this platform */
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DECLARE_FAN_FAULT_SENSOR_DEV_ATTR(1,11);
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DECLARE_FAN_FAULT_SENSOR_DEV_ATTR(2,12);
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DECLARE_FAN_FAULT_SENSOR_DEV_ATTR(3,13);
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DECLARE_FAN_FAULT_SENSOR_DEV_ATTR(4,14);
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/* 6 fan speed(rpm) attributes in this platform */
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DECLARE_FAN_SPEED_RPM_SENSOR_DEV_ATTR(1,11);
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DECLARE_FAN_SPEED_RPM_SENSOR_DEV_ATTR(2,12);
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DECLARE_FAN_SPEED_RPM_SENSOR_DEV_ATTR(3,13);
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DECLARE_FAN_SPEED_RPM_SENSOR_DEV_ATTR(4,14);
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/* 6 fan present attributes in this platform */
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DECLARE_FAN_PRESENT_SENSOR_DEV_ATTR(1);
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DECLARE_FAN_PRESENT_SENSOR_DEV_ATTR(2);
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DECLARE_FAN_PRESENT_SENSOR_DEV_ATTR(3);
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DECLARE_FAN_PRESENT_SENSOR_DEV_ATTR(4);
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/* 6 fan direction attribute in this platform */
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DECLARE_FAN_DIRECTION_SENSOR_DEV_ATTR(1);
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DECLARE_FAN_DIRECTION_SENSOR_DEV_ATTR(2);
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DECLARE_FAN_DIRECTION_SENSOR_DEV_ATTR(3);
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DECLARE_FAN_DIRECTION_SENSOR_DEV_ATTR(4);
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/* 1 fan duty cycle attribute in this platform */
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DECLARE_FAN_DUTY_CYCLE_SENSOR_DEV_ATTR(1);
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static struct attribute *as7816_64x_fan_attributes[] = {
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/* fan related attributes */
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DECLARE_FAN_FAULT_ATTR(1,11),
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DECLARE_FAN_FAULT_ATTR(2,12),
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DECLARE_FAN_FAULT_ATTR(3,13),
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DECLARE_FAN_FAULT_ATTR(4,14),
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DECLARE_FAN_SPEED_RPM_ATTR(1,11),
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DECLARE_FAN_SPEED_RPM_ATTR(2,12),
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DECLARE_FAN_SPEED_RPM_ATTR(3,13),
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DECLARE_FAN_SPEED_RPM_ATTR(4,14),
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DECLARE_FAN_PRESENT_ATTR(1),
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DECLARE_FAN_PRESENT_ATTR(2),
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DECLARE_FAN_PRESENT_ATTR(3),
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DECLARE_FAN_PRESENT_ATTR(4),
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DECLARE_FAN_DIRECTION_ATTR(1),
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DECLARE_FAN_DIRECTION_ATTR(2),
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DECLARE_FAN_DIRECTION_ATTR(3),
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DECLARE_FAN_DIRECTION_ATTR(4),
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DECLARE_FAN_DUTY_CYCLE_ATTR(1),
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NULL
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};
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#define FAN_DUTY_CYCLE_REG_MASK 0xF
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#define FAN_MAX_DUTY_CYCLE 100
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#define FAN_REG_VAL_TO_SPEED_RPM_STEP 100
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static int as7816_64x_fan_read_value(struct i2c_client *client, u8 reg)
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{
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return i2c_smbus_read_byte_data(client, reg);
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}
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static int as7816_64x_fan_write_value(struct i2c_client *client, u8 reg, u8 value)
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{
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return i2c_smbus_write_byte_data(client, reg, value);
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}
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/* fan utility functions
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*/
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static u32 reg_val_to_duty_cycle(u8 reg_val)
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{
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reg_val &= FAN_DUTY_CYCLE_REG_MASK;
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if (!reg_val) {
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return 0;
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}
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if (reg_val == 0xF) {
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return FAN_MAX_DUTY_CYCLE;
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}
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return (reg_val * 6) + 10;
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}
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static u8 duty_cycle_to_reg_val(u8 duty_cycle)
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{
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if (duty_cycle < 16) {
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return 0;
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}
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if (duty_cycle >= 100) {
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return 0xF;
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}
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return (duty_cycle - 10) / 6;
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}
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static u32 reg_val_to_speed_rpm(u8 reg_val)
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{
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return (u32)reg_val * FAN_REG_VAL_TO_SPEED_RPM_STEP;
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}
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static u8 reg_val_to_direction(u8 reg_val, enum fan_id id)
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{
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u8 mask = (1 << id);
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return !!(reg_val & mask);
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}
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static u8 reg_val_to_is_present(u8 reg_val, enum fan_id id)
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{
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u8 mask = (1 << id);
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return !(reg_val & mask);
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}
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static u8 is_fan_fault(struct as7816_64x_fan_data *data, enum fan_id id)
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{
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u8 ret = 1;
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int front_fan_index = FAN1_FRONT_SPEED_RPM + id;
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int rear_fan_index = FAN1_REAR_SPEED_RPM + id;
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/* Check if the speed of front or rear fan is ZERO,
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*/
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if (reg_val_to_speed_rpm(data->reg_val[front_fan_index]) &&
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reg_val_to_speed_rpm(data->reg_val[rear_fan_index])) {
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ret = 0;
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}
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return ret;
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}
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static ssize_t set_duty_cycle(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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int error, value;
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struct i2c_client *client = to_i2c_client(dev);
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error = kstrtoint(buf, 10, &value);
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if (error)
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return error;
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if (value < 0 || value > FAN_MAX_DUTY_CYCLE)
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return -EINVAL;
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as7816_64x_fan_write_value(client, 0x28, 0); /* Disable fan speed watch dog */
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as7816_64x_fan_write_value(client, fan_reg[FAN_DUTY_CYCLE_PERCENTAGE], duty_cycle_to_reg_val(value));
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return count;
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}
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static ssize_t fan_show_value(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct as7816_64x_fan_data *data = as7816_64x_fan_update_device(dev);
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ssize_t ret = 0;
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if (data->valid) {
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switch (attr->index) {
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case FAN_DUTY_CYCLE_PERCENTAGE:
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{
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u32 duty_cycle = reg_val_to_duty_cycle(data->reg_val[FAN_DUTY_CYCLE_PERCENTAGE]);
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ret = sprintf(buf, "%u\n", duty_cycle);
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break;
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}
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case FAN1_FRONT_SPEED_RPM:
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case FAN2_FRONT_SPEED_RPM:
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case FAN3_FRONT_SPEED_RPM:
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case FAN4_FRONT_SPEED_RPM:
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case FAN1_REAR_SPEED_RPM:
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case FAN2_REAR_SPEED_RPM:
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case FAN3_REAR_SPEED_RPM:
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case FAN4_REAR_SPEED_RPM:
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{
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ret = sprintf(buf, "%u\n", reg_val_to_speed_rpm(data->reg_val[attr->index]));
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break;
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}
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case FAN1_PRESENT:
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case FAN2_PRESENT:
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case FAN3_PRESENT:
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case FAN4_PRESENT:
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ret = sprintf(buf, "%d\n",
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reg_val_to_is_present(data->reg_val[FAN_PRESENT_REG],
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attr->index - FAN1_PRESENT));
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break;
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case FAN1_FAULT:
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case FAN2_FAULT:
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case FAN3_FAULT:
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case FAN4_FAULT:
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ret = sprintf(buf, "%d\n", is_fan_fault(data, attr->index - FAN1_FAULT));
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break;
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case FAN1_DIRECTION:
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case FAN2_DIRECTION:
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case FAN3_DIRECTION:
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case FAN4_DIRECTION:
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ret = sprintf(buf, "%d\n",
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reg_val_to_direction(data->reg_val[FAN_DIRECTION_REG],
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attr->index - FAN1_DIRECTION));
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct attribute_group as7816_64x_fan_group = {
|
||
|
|
.attrs = as7816_64x_fan_attributes,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct as7816_64x_fan_data *as7816_64x_fan_update_device(struct device *dev)
|
||
|
|
{
|
||
|
|
struct i2c_client *client = to_i2c_client(dev);
|
||
|
|
struct as7816_64x_fan_data *data = i2c_get_clientdata(client);
|
||
|
|
|
||
|
|
mutex_lock(&data->update_lock);
|
||
|
|
|
||
|
|
if (time_after(jiffies, data->last_updated + HZ + HZ / 2) ||
|
||
|
|
!data->valid) {
|
||
|
|
int i;
|
||
|
|
|
||
|
|
dev_dbg(&client->dev, "Starting as7816_64x_fan update\n");
|
||
|
|
data->valid = 0;
|
||
|
|
|
||
|
|
/* Update fan data
|
||
|
|
*/
|
||
|
|
for (i = 0; i < ARRAY_SIZE(data->reg_val); i++) {
|
||
|
|
int status = as7816_64x_fan_read_value(client, fan_reg[i]);
|
||
|
|
|
||
|
|
if (status < 0) {
|
||
|
|
data->valid = 0;
|
||
|
|
mutex_unlock(&data->update_lock);
|
||
|
|
dev_dbg(&client->dev, "reg %d, err %d\n", fan_reg[i], status);
|
||
|
|
return data;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
data->reg_val[i] = status;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
data->last_updated = jiffies;
|
||
|
|
data->valid = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_unlock(&data->update_lock);
|
||
|
|
|
||
|
|
return data;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int as7816_64x_fan_probe(struct i2c_client *client,
|
||
|
|
const struct i2c_device_id *dev_id)
|
||
|
|
{
|
||
|
|
struct as7816_64x_fan_data *data;
|
||
|
|
int status;
|
||
|
|
|
||
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
|
||
|
|
status = -EIO;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
data = kzalloc(sizeof(struct as7816_64x_fan_data), GFP_KERNEL);
|
||
|
|
if (!data) {
|
||
|
|
status = -ENOMEM;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
i2c_set_clientdata(client, data);
|
||
|
|
data->valid = 0;
|
||
|
|
mutex_init(&data->update_lock);
|
||
|
|
|
||
|
|
dev_info(&client->dev, "chip found\n");
|
||
|
|
|
||
|
|
/* Register sysfs hooks */
|
||
|
|
status = sysfs_create_group(&client->dev.kobj, &as7816_64x_fan_group);
|
||
|
|
if (status) {
|
||
|
|
goto exit_free;
|
||
|
|
}
|
||
|
|
|
||
|
|
data->hwmon_dev = hwmon_device_register(&client->dev);
|
||
|
|
if (IS_ERR(data->hwmon_dev)) {
|
||
|
|
status = PTR_ERR(data->hwmon_dev);
|
||
|
|
goto exit_remove;
|
||
|
|
}
|
||
|
|
|
||
|
|
dev_info(&client->dev, "%s: fan '%s'\n",
|
||
|
|
dev_name(data->hwmon_dev), client->name);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
exit_remove:
|
||
|
|
sysfs_remove_group(&client->dev.kobj, &as7816_64x_fan_group);
|
||
|
|
exit_free:
|
||
|
|
kfree(data);
|
||
|
|
exit:
|
||
|
|
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int as7816_64x_fan_remove(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
struct as7816_64x_fan_data *data = i2c_get_clientdata(client);
|
||
|
|
hwmon_device_unregister(data->hwmon_dev);
|
||
|
|
sysfs_remove_group(&client->dev.kobj, &as7816_64x_fan_group);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Addresses to scan */
|
||
|
|
static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
|
||
|
|
|
||
|
|
static const struct i2c_device_id as7816_64x_fan_id[] = {
|
||
|
|
{ "as7816_64x_fan", 0 },
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(i2c, as7816_64x_fan_id);
|
||
|
|
|
||
|
|
static struct i2c_driver as7816_64x_fan_driver = {
|
||
|
|
.class = I2C_CLASS_HWMON,
|
||
|
|
.driver = {
|
||
|
|
.name = DRVNAME,
|
||
|
|
},
|
||
|
|
.probe = as7816_64x_fan_probe,
|
||
|
|
.remove = as7816_64x_fan_remove,
|
||
|
|
.id_table = as7816_64x_fan_id,
|
||
|
|
.address_list = normal_i2c,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init as7816_64x_fan_init(void)
|
||
|
|
{
|
||
|
|
return i2c_add_driver(&as7816_64x_fan_driver);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit as7816_64x_fan_exit(void)
|
||
|
|
{
|
||
|
|
i2c_del_driver(&as7816_64x_fan_driver);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(as7816_64x_fan_init);
|
||
|
|
module_exit(as7816_64x_fan_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Brandon Chuang <brandon_chuang@accton.com.tw>");
|
||
|
|
MODULE_DESCRIPTION("as7816_64x_fan driver");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
|