443 lines
15 KiB
C
443 lines
15 KiB
C
/*
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* A hwmon driver for the Accton as5812 54t fan
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*
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* Copyright (C) 2015 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/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/sysfs.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/syscalls.h>
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#include <linux/kthread.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#define FAN_MAX_NUMBER 5
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#define FAN_SPEED_CPLD_TO_RPM_STEP 150
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#define FAN_SPEED_PRECENT_TO_CPLD_STEP 5
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#define FAN_DUTY_CYCLE_MIN 0
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#define FAN_DUTY_CYCLE_MAX 100 /* 100% */
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#define CPLD_REG_FAN_STATUS_OFFSET 0xC
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#define CPLD_REG_FANR_STATUS_OFFSET 0x1F
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#define CPLD_REG_FAN_DIRECTION_OFFSET 0x1E
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#define CPLD_FAN1_REG_SPEED_OFFSET 0x10
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#define CPLD_FAN2_REG_SPEED_OFFSET 0x11
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#define CPLD_FAN3_REG_SPEED_OFFSET 0x12
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#define CPLD_FAN4_REG_SPEED_OFFSET 0x13
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#define CPLD_FAN5_REG_SPEED_OFFSET 0x14
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#define CPLD_FANR1_REG_SPEED_OFFSET 0x18
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#define CPLD_FANR2_REG_SPEED_OFFSET 0x19
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#define CPLD_FANR3_REG_SPEED_OFFSET 0x1A
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#define CPLD_FANR4_REG_SPEED_OFFSET 0x1B
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#define CPLD_FANR5_REG_SPEED_OFFSET 0x1C
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#define CPLD_REG_FAN_PWM_CYCLE_OFFSET 0xD
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#define CPLD_FAN1_INFO_BIT_MASK 0x1
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#define CPLD_FAN2_INFO_BIT_MASK 0x2
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#define CPLD_FAN3_INFO_BIT_MASK 0x4
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#define CPLD_FAN4_INFO_BIT_MASK 0x8
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#define CPLD_FAN5_INFO_BIT_MASK 0x10
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#define PROJECT_NAME
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#define LOCAL_DEBUG 0
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static struct accton_as5812_54t_fan *fan_data = NULL;
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struct accton_as5812_54t_fan {
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struct platform_device *pdev;
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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 status[FAN_MAX_NUMBER]; /* inner first fan status */
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u32 speed[FAN_MAX_NUMBER]; /* inner first fan speed */
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u8 direction[FAN_MAX_NUMBER]; /* reconrd the direction of inner first and second fans */
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u32 duty_cycle[FAN_MAX_NUMBER]; /* control the speed of inner first and second fans */
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u8 r_status[FAN_MAX_NUMBER]; /* inner second fan status */
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u32 r_speed[FAN_MAX_NUMBER]; /* inner second fan speed */
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};
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/*******************/
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#define MAKE_FAN_MASK_OR_REG(name,type) \
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CPLD_FAN##type##1_##name, \
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CPLD_FAN##type##2_##name, \
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CPLD_FAN##type##3_##name, \
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CPLD_FAN##type##4_##name, \
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CPLD_FAN##type##5_##name,
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/* fan related data
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*/
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static const u8 fan_info_mask[] = {
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MAKE_FAN_MASK_OR_REG(INFO_BIT_MASK,)
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};
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static const u8 fan_speed_reg[] = {
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MAKE_FAN_MASK_OR_REG(REG_SPEED_OFFSET,)
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};
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static const u8 fanr_speed_reg[] = {
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MAKE_FAN_MASK_OR_REG(REG_SPEED_OFFSET,R)
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};
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/*******************/
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#define DEF_FAN_SET(id) \
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FAN##id##_FAULT, \
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FAN##id##_SPEED, \
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FAN##id##_DUTY_CYCLE, \
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FAN##id##_DIRECTION, \
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FANR##id##_FAULT, \
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FANR##id##_SPEED,
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enum sysfs_fan_attributes {
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DEF_FAN_SET(1)
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DEF_FAN_SET(2)
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DEF_FAN_SET(3)
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DEF_FAN_SET(4)
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DEF_FAN_SET(5)
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};
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/*******************/
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static void accton_as5812_54t_fan_update_device(struct device *dev);
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static int accton_as5812_54t_fan_read_value(u8 reg);
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static int accton_as5812_54t_fan_write_value(u8 reg, u8 value);
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static ssize_t fan_set_duty_cycle(struct device *dev,
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struct device_attribute *da,const char *buf, size_t count);
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static ssize_t fan_show_value(struct device *dev,
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struct device_attribute *da, char *buf);
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extern int accton_i2c_cpld_read(unsigned short cpld_addr, u8 reg);
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extern int accton_i2c_cpld_write(unsigned short cpld_addr, u8 reg, u8 value);
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/*******************/
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#define _MAKE_SENSOR_DEVICE_ATTR(prj, id) \
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static SENSOR_DEVICE_ATTR(prj##fan##id##_fault, S_IRUGO, fan_show_value, NULL, FAN##id##_FAULT); \
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static SENSOR_DEVICE_ATTR(prj##fan##id##_speed_rpm, S_IRUGO, fan_show_value, NULL, FAN##id##_SPEED); \
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static SENSOR_DEVICE_ATTR(prj##fan##id##_duty_cycle_percentage, S_IWUSR | S_IRUGO, fan_show_value, \
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fan_set_duty_cycle, FAN##id##_DUTY_CYCLE); \
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static SENSOR_DEVICE_ATTR(prj##fan##id##_direction, S_IRUGO, fan_show_value, NULL, FAN##id##_DIRECTION); \
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static SENSOR_DEVICE_ATTR(prj##fanr##id##_fault, S_IRUGO, fan_show_value, NULL, FANR##id##_FAULT); \
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static SENSOR_DEVICE_ATTR(prj##fanr##id##_speed_rpm, S_IRUGO, fan_show_value, NULL, FANR##id##_SPEED);
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#define MAKE_SENSOR_DEVICE_ATTR(prj,id) _MAKE_SENSOR_DEVICE_ATTR(prj,id)
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MAKE_SENSOR_DEVICE_ATTR(PROJECT_NAME, 1)
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MAKE_SENSOR_DEVICE_ATTR(PROJECT_NAME, 2)
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MAKE_SENSOR_DEVICE_ATTR(PROJECT_NAME, 3)
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MAKE_SENSOR_DEVICE_ATTR(PROJECT_NAME, 4)
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MAKE_SENSOR_DEVICE_ATTR(PROJECT_NAME, 5)
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/*******************/
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#define _MAKE_FAN_ATTR(prj, id) \
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&sensor_dev_attr_##prj##fan##id##_fault.dev_attr.attr, \
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&sensor_dev_attr_##prj##fan##id##_speed_rpm.dev_attr.attr, \
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&sensor_dev_attr_##prj##fan##id##_duty_cycle_percentage.dev_attr.attr,\
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&sensor_dev_attr_##prj##fan##id##_direction.dev_attr.attr, \
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&sensor_dev_attr_##prj##fanr##id##_fault.dev_attr.attr, \
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&sensor_dev_attr_##prj##fanr##id##_speed_rpm.dev_attr.attr,
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#define MAKE_FAN_ATTR(prj, id) _MAKE_FAN_ATTR(prj, id)
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static struct attribute *accton_as5812_54t_fan_attributes[] = {
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/* fan related attributes */
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MAKE_FAN_ATTR(PROJECT_NAME,1)
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MAKE_FAN_ATTR(PROJECT_NAME,2)
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MAKE_FAN_ATTR(PROJECT_NAME,3)
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MAKE_FAN_ATTR(PROJECT_NAME,4)
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MAKE_FAN_ATTR(PROJECT_NAME,5)
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NULL
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};
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/*******************/
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/* fan related functions
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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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ssize_t ret = 0;
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int data_index, type_index;
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accton_as5812_54t_fan_update_device(dev);
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if (fan_data->valid == 0) {
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return ret;
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}
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type_index = attr->index%FAN2_FAULT;
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data_index = attr->index/FAN2_FAULT;
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switch (type_index) {
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case FAN1_FAULT:
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ret = sprintf(buf, "%d\n", fan_data->status[data_index]);
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if (LOCAL_DEBUG)
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printk ("[Check !!][%s][%d][type->index=%d][data->index=%d]\n", __FUNCTION__, __LINE__, type_index, data_index);
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break;
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case FAN1_SPEED:
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ret = sprintf(buf, "%d\n", fan_data->speed[data_index]);
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if (LOCAL_DEBUG)
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printk ("[Check !!][%s][%d][type->index=%d][data->index=%d]\n", __FUNCTION__, __LINE__, type_index, data_index);
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break;
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case FAN1_DUTY_CYCLE:
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ret = sprintf(buf, "%d\n", fan_data->duty_cycle[data_index]);
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if (LOCAL_DEBUG)
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printk ("[Check !!][%s][%d][type->index=%d][data->index=%d]\n", __FUNCTION__, __LINE__, type_index, data_index);
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break;
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case FAN1_DIRECTION:
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ret = sprintf(buf, "%d\n", fan_data->direction[data_index]); /* presnet, need to modify*/
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if (LOCAL_DEBUG)
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printk ("[Check !!][%s][%d][type->index=%d][data->index=%d]\n", __FUNCTION__, __LINE__, type_index, data_index);
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break;
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case FANR1_FAULT:
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ret = sprintf(buf, "%d\n", fan_data->r_status[data_index]);
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if (LOCAL_DEBUG)
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printk ("[Check !!][%s][%d][type->index=%d][data->index=%d]\n", __FUNCTION__, __LINE__, type_index, data_index);
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break;
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case FANR1_SPEED:
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ret = sprintf(buf, "%d\n", fan_data->r_speed[data_index]);
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if (LOCAL_DEBUG)
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printk ("[Check !!][%s][%d][type->index=%d][data->index=%d]\n", __FUNCTION__, __LINE__, type_index, data_index);
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break;
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default:
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if (LOCAL_DEBUG)
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printk ("[Check !!][%s][%d] \n", __FUNCTION__, __LINE__);
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break;
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}
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return ret;
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}
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/*******************/
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static ssize_t fan_set_duty_cycle(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count) {
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int error, value;
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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 < FAN_DUTY_CYCLE_MIN || value > FAN_DUTY_CYCLE_MAX)
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return -EINVAL;
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accton_as5812_54t_fan_write_value(CPLD_REG_FAN_PWM_CYCLE_OFFSET, value/FAN_SPEED_PRECENT_TO_CPLD_STEP);
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fan_data->valid = 0;
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return count;
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}
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static const struct attribute_group accton_as5812_54t_fan_group = {
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.attrs = accton_as5812_54t_fan_attributes,
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};
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static int accton_as5812_54t_fan_read_value(u8 reg)
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{
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return accton_i2c_cpld_read(0x60, reg);
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}
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static int accton_as5812_54t_fan_write_value(u8 reg, u8 value)
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{
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return accton_i2c_cpld_write(0x60, reg, value);
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}
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static void accton_as5812_54t_fan_update_device(struct device *dev)
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{
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int speed, r_speed, fault, r_fault, ctrl_speed, direction;
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int i;
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mutex_lock(&fan_data->update_lock);
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if (LOCAL_DEBUG)
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printk ("Starting accton_as5812_54t_fan update \n");
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if (!(time_after(jiffies, fan_data->last_updated + HZ + HZ / 2) || !fan_data->valid)) {
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/* do nothing */
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goto _exit;
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}
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fan_data->valid = 0;
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if (LOCAL_DEBUG)
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printk ("Starting accton_as5812_54t_fan update 2 \n");
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fault = accton_as5812_54t_fan_read_value(CPLD_REG_FAN_STATUS_OFFSET);
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r_fault = accton_as5812_54t_fan_read_value(CPLD_REG_FANR_STATUS_OFFSET);
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direction = accton_as5812_54t_fan_read_value(CPLD_REG_FAN_DIRECTION_OFFSET);
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ctrl_speed = accton_as5812_54t_fan_read_value(CPLD_REG_FAN_PWM_CYCLE_OFFSET);
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if ( (fault < 0) || (r_fault < 0) || (direction < 0) || (ctrl_speed < 0) )
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{
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if (LOCAL_DEBUG)
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printk ("[Error!!][%s][%d] \n", __FUNCTION__, __LINE__);
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goto _exit; /* error */
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}
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if (LOCAL_DEBUG)
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printk ("[fan:] fault:%d, r_fault=%d, direction=%d, ctrl_speed=%d \n",fault, r_fault, direction, ctrl_speed);
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for (i=0; i<FAN_MAX_NUMBER; i++)
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{
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/* Update fan data
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*/
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/* fan fault
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* 0: normal, 1:abnormal
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* Each FAN-tray module has two fans.
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*/
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fan_data->status[i] = (fault & fan_info_mask[i]) >> i;
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if (LOCAL_DEBUG)
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printk ("[fan%d:] fail=%d \n",i, fan_data->status[i]);
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fan_data->r_status[i] = (r_fault & fan_info_mask[i]) >> i;
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fan_data->direction[i] = (direction & fan_info_mask[i]) >> i;
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fan_data->duty_cycle[i] = ctrl_speed * FAN_SPEED_PRECENT_TO_CPLD_STEP;
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/* fan speed
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*/
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speed = accton_as5812_54t_fan_read_value(fan_speed_reg[i]);
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r_speed = accton_as5812_54t_fan_read_value(fanr_speed_reg[i]);
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if ( (speed < 0) || (r_speed < 0) )
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{
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if (LOCAL_DEBUG)
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printk ("[Error!!][%s][%d] \n", __FUNCTION__, __LINE__);
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goto _exit; /* error */
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}
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if (LOCAL_DEBUG)
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printk ("[fan%d:] speed:%d, r_speed=%d \n", i, speed, r_speed);
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fan_data->speed[i] = speed * FAN_SPEED_CPLD_TO_RPM_STEP;
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fan_data->r_speed[i] = r_speed * FAN_SPEED_CPLD_TO_RPM_STEP;
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}
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/* finish to update */
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fan_data->last_updated = jiffies;
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fan_data->valid = 1;
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_exit:
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mutex_unlock(&fan_data->update_lock);
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}
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static int accton_as5812_54t_fan_probe(struct platform_device *pdev)
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{
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int status = -1;
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/* Register sysfs hooks */
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status = sysfs_create_group(&pdev->dev.kobj, &accton_as5812_54t_fan_group);
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if (status) {
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goto exit;
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}
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fan_data->hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(fan_data->hwmon_dev)) {
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status = PTR_ERR(fan_data->hwmon_dev);
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goto exit_remove;
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}
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dev_info(&pdev->dev, "accton_as5812_54t_fan\n");
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return 0;
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exit_remove:
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sysfs_remove_group(&pdev->dev.kobj, &accton_as5812_54t_fan_group);
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exit:
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return status;
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}
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static int accton_as5812_54t_fan_remove(struct platform_device *pdev)
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{
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hwmon_device_unregister(fan_data->hwmon_dev);
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sysfs_remove_group(&fan_data->pdev->dev.kobj, &accton_as5812_54t_fan_group);
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return 0;
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}
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#define DRVNAME "as5812_54t_fan"
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static struct platform_driver accton_as5812_54t_fan_driver = {
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.probe = accton_as5812_54t_fan_probe,
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.remove = accton_as5812_54t_fan_remove,
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.driver = {
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.name = DRVNAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init accton_as5812_54t_fan_init(void)
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{
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int ret;
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extern int platform_accton_as5812_54t(void);
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if (!platform_accton_as5812_54t()) {
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return -ENODEV;
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}
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ret = platform_driver_register(&accton_as5812_54t_fan_driver);
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if (ret < 0) {
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goto exit;
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}
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fan_data = kzalloc(sizeof(struct accton_as5812_54t_fan), GFP_KERNEL);
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if (!fan_data) {
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ret = -ENOMEM;
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platform_driver_unregister(&accton_as5812_54t_fan_driver);
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goto exit;
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}
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mutex_init(&fan_data->update_lock);
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fan_data->valid = 0;
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fan_data->pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
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if (IS_ERR(fan_data->pdev)) {
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ret = PTR_ERR(fan_data->pdev);
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platform_driver_unregister(&accton_as5812_54t_fan_driver);
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kfree(fan_data);
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goto exit;
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}
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exit:
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return ret;
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}
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static void __exit accton_as5812_54t_fan_exit(void)
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{
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platform_device_unregister(fan_data->pdev);
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platform_driver_unregister(&accton_as5812_54t_fan_driver);
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kfree(fan_data);
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}
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MODULE_AUTHOR("Brandon Chuang <brandon_chuang@accton.com.tw>");
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MODULE_DESCRIPTION("accton_as5812_54t_fan driver");
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MODULE_LICENSE("GPL");
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module_init(accton_as5812_54t_fan_init);
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module_exit(accton_as5812_54t_fan_exit);
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