2007-05-08 17:22:00 +02:00
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/*
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* max6650.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring.
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*
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2010-11-15 21:38:56 +01:00
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* (C) 2007 by Hans J. Koch <hjk@hansjkoch.de>
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2007-05-08 17:22:00 +02:00
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*
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* based on code written by John Morris <john.morris@spirentcom.com>
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* Copyright (c) 2003 Spirent Communications
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* and Claus Gindhart <claus.gindhart@kontron.com>
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*
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* This module has only been tested with the MAX6650 chip. It should
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* also work with the MAX6651. It does not distinguish max6650 and max6651
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* chips.
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*
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2009-06-15 18:39:52 +02:00
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* The datasheet was last seen at:
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2007-05-08 17:22:00 +02:00
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*
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* http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
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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/init.h>
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#include <linux/slab.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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2016-08-22 08:47:51 +02:00
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#include <linux/of_device.h>
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2007-05-08 17:22:00 +02:00
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/*
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* Insmod parameters
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*/
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/* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */
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static int fan_voltage;
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/* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */
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static int prescaler;
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2016-08-22 08:47:51 +02:00
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/* clock: The clock frequency of the chip (max6651 can be clocked externally) */
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2007-05-08 17:22:00 +02:00
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static int clock = 254000;
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module_param(fan_voltage, int, S_IRUGO);
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module_param(prescaler, int, S_IRUGO);
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module_param(clock, int, S_IRUGO);
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/*
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* MAX 6650/6651 registers
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*/
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#define MAX6650_REG_SPEED 0x00
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#define MAX6650_REG_CONFIG 0x02
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#define MAX6650_REG_GPIO_DEF 0x04
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#define MAX6650_REG_DAC 0x06
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#define MAX6650_REG_ALARM_EN 0x08
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#define MAX6650_REG_ALARM 0x0A
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#define MAX6650_REG_TACH0 0x0C
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#define MAX6650_REG_TACH1 0x0E
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#define MAX6650_REG_TACH2 0x10
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#define MAX6650_REG_TACH3 0x12
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#define MAX6650_REG_GPIO_STAT 0x14
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#define MAX6650_REG_COUNT 0x16
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/*
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* Config register bits
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*/
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#define MAX6650_CFG_V12 0x08
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#define MAX6650_CFG_PRESCALER_MASK 0x07
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#define MAX6650_CFG_PRESCALER_2 0x01
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#define MAX6650_CFG_PRESCALER_4 0x02
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#define MAX6650_CFG_PRESCALER_8 0x03
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#define MAX6650_CFG_PRESCALER_16 0x04
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#define MAX6650_CFG_MODE_MASK 0x30
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#define MAX6650_CFG_MODE_ON 0x00
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#define MAX6650_CFG_MODE_OFF 0x10
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#define MAX6650_CFG_MODE_CLOSED_LOOP 0x20
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#define MAX6650_CFG_MODE_OPEN_LOOP 0x30
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#define MAX6650_COUNT_MASK 0x03
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2009-06-15 18:39:52 +02:00
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/*
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* Alarm status register bits
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*/
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#define MAX6650_ALRM_MAX 0x01
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#define MAX6650_ALRM_MIN 0x02
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#define MAX6650_ALRM_TACH 0x04
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#define MAX6650_ALRM_GPIO1 0x08
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#define MAX6650_ALRM_GPIO2 0x10
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2007-05-08 17:22:00 +02:00
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/* Minimum and maximum values of the FAN-RPM */
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#define FAN_RPM_MIN 240
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#define FAN_RPM_MAX 30000
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#define DIV_FROM_REG(reg) (1 << (reg & 7))
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/*
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* Client data (each client gets its own)
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*/
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2012-01-15 06:32:21 +01:00
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struct max6650_data {
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2014-02-12 07:37:01 +01:00
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struct i2c_client *client;
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const struct attribute_group *groups[3];
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2007-05-08 17:22:00 +02:00
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struct mutex update_lock;
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2011-05-25 20:43:32 +02:00
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int nr_fans;
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2007-05-08 17:22:00 +02:00
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char 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 speed;
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u8 config;
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u8 tach[4];
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u8 count;
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u8 dac;
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2009-06-15 18:39:52 +02:00
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u8 alarm;
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2007-05-08 17:22:00 +02:00
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};
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2014-02-12 07:26:12 +01:00
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static const u8 tach_reg[] = {
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MAX6650_REG_TACH0,
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MAX6650_REG_TACH1,
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MAX6650_REG_TACH2,
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MAX6650_REG_TACH3,
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};
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2016-08-22 08:47:51 +02:00
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static const struct of_device_id max6650_dt_match[] = {
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{
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.compatible = "maxim,max6650",
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.data = (void *)1
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},
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{
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.compatible = "maxim,max6651",
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.data = (void *)4
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, max6650_dt_match);
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2014-02-12 07:26:12 +01:00
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static struct max6650_data *max6650_update_device(struct device *dev)
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{
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2014-02-12 07:37:01 +01:00
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struct max6650_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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2014-02-12 07:26:12 +01:00
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int i;
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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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data->speed = i2c_smbus_read_byte_data(client,
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MAX6650_REG_SPEED);
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data->config = i2c_smbus_read_byte_data(client,
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MAX6650_REG_CONFIG);
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for (i = 0; i < data->nr_fans; i++) {
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data->tach[i] = i2c_smbus_read_byte_data(client,
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tach_reg[i]);
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}
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data->count = i2c_smbus_read_byte_data(client,
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MAX6650_REG_COUNT);
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data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
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/*
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* Alarms are cleared on read in case the condition that
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* caused the alarm is removed. Keep the value latched here
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* for providing the register through different alarm files.
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*/
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data->alarm |= i2c_smbus_read_byte_data(client,
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MAX6650_REG_ALARM);
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data->last_updated = jiffies;
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data->valid = 1;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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2016-08-24 10:13:26 +02:00
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/*
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* Change the operating mode of the chip (if needed).
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* mode is one of the MAX6650_CFG_MODE_* values.
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*/
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static int max6650_set_operating_mode(struct max6650_data *data, u8 mode)
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{
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int result;
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u8 config = data->config;
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if (mode == (config & MAX6650_CFG_MODE_MASK))
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return 0;
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config = (config & ~MAX6650_CFG_MODE_MASK) | mode;
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result = i2c_smbus_write_byte_data(data->client, MAX6650_REG_CONFIG,
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config);
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if (result < 0)
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return result;
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data->config = config;
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return 0;
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}
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2007-05-08 17:22:00 +02:00
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static ssize_t get_fan(struct device *dev, struct device_attribute *devattr,
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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 max6650_data *data = max6650_update_device(dev);
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int rpm;
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/*
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2012-01-19 20:02:22 +01:00
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* Calculation details:
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*
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* Each tachometer counts over an interval given by the "count"
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* register (0.25, 0.5, 1 or 2 seconds). This module assumes
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* that the fans produce two pulses per revolution (this seems
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* to be the most common).
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*/
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2007-05-08 17:22:00 +02:00
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rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count));
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return sprintf(buf, "%d\n", rpm);
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}
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/*
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* Set the fan speed to the specified RPM (or read back the RPM setting).
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* This works in closed loop mode only. Use pwm1 for open loop speed setting.
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*
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* The MAX6650/1 will automatically control fan speed when in closed loop
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* mode.
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*
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* Assumptions:
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*
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* 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use
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* the clock module parameter if you need to fine tune this.
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*
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* 2) The prescaler (low three bits of the config register) has already
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* been set to an appropriate value. Use the prescaler module parameter
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* if your BIOS doesn't initialize the chip properly.
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*
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* The relevant equations are given on pages 21 and 22 of the datasheet.
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*
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* From the datasheet, the relevant equation when in regulation is:
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*
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* [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE
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*
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* where:
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*
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* fCLK is the oscillator frequency (either the 254kHz internal
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* oscillator or the externally applied clock)
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*
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* KTACH is the value in the speed register
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*
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* FanSpeed is the speed of the fan in rps
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*
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* KSCALE is the prescaler value (1, 2, 4, 8, or 16)
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*
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* When reading, we need to solve for FanSpeed. When writing, we need to
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* solve for KTACH.
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*
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* Note: this tachometer is completely separate from the tachometers
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* used to measure the fan speeds. Only one fan's speed (fan1) is
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* controlled.
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*/
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static ssize_t get_target(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct max6650_data *data = max6650_update_device(dev);
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int kscale, ktach, rpm;
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/*
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2012-01-19 20:02:22 +01:00
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* Use the datasheet equation:
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*
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* FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)]
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*
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* then multiply by 60 to give rpm.
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*/
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2007-05-08 17:22:00 +02:00
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kscale = DIV_FROM_REG(data->config);
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ktach = data->speed;
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rpm = 60 * kscale * clock / (256 * (ktach + 1));
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return sprintf(buf, "%d\n", rpm);
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}
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2016-08-24 10:13:26 +02:00
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static int max6650_set_target(struct max6650_data *data, unsigned long rpm)
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2007-05-08 17:22:00 +02:00
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{
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int kscale, ktach;
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2012-01-15 06:32:21 +01:00
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2016-08-24 10:13:26 +02:00
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if (rpm == 0)
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return max6650_set_operating_mode(data, MAX6650_CFG_MODE_OFF);
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2007-05-08 17:22:00 +02:00
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2013-01-09 17:09:34 +01:00
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rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
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2007-05-08 17:22:00 +02:00
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/*
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2012-01-19 20:02:22 +01:00
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* Divide the required speed by 60 to get from rpm to rps, then
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* use the datasheet equation:
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*
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* KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1
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*/
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2007-05-08 17:22:00 +02:00
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kscale = DIV_FROM_REG(data->config);
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ktach = ((clock * kscale) / (256 * rpm / 60)) - 1;
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if (ktach < 0)
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ktach = 0;
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if (ktach > 255)
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ktach = 255;
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data->speed = ktach;
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2016-08-24 10:13:26 +02:00
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return i2c_smbus_write_byte_data(data->client, MAX6650_REG_SPEED,
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data->speed);
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}
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static ssize_t set_target(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct max6650_data *data = dev_get_drvdata(dev);
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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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err = max6650_set_target(data, rpm);
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2007-05-08 17:22:00 +02:00
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mutex_unlock(&data->update_lock);
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2016-08-24 10:13:26 +02:00
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if (err < 0)
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return err;
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2007-05-08 17:22:00 +02:00
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return count;
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}
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/*
|
|
|
|
* Get/set the fan speed in open loop mode using pwm1 sysfs file.
|
|
|
|
* Speed is given as a relative value from 0 to 255, where 255 is maximum
|
|
|
|
* speed. Note that this is done by writing directly to the chip's DAC,
|
|
|
|
* it won't change the closed loop speed set by fan1_target.
|
|
|
|
* Also note that due to rounding errors it is possible that you don't read
|
|
|
|
* back exactly the value you have set.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static ssize_t get_pwm(struct device *dev, struct device_attribute *devattr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
int pwm;
|
|
|
|
struct max6650_data *data = max6650_update_device(dev);
|
|
|
|
|
2012-01-19 20:02:22 +01:00
|
|
|
/*
|
|
|
|
* Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans.
|
|
|
|
* Lower DAC values mean higher speeds.
|
|
|
|
*/
|
2007-05-08 17:22:00 +02:00
|
|
|
if (data->config & MAX6650_CFG_V12)
|
|
|
|
pwm = 255 - (255 * (int)data->dac)/180;
|
|
|
|
else
|
|
|
|
pwm = 255 - (255 * (int)data->dac)/76;
|
|
|
|
|
|
|
|
if (pwm < 0)
|
|
|
|
pwm = 0;
|
|
|
|
|
|
|
|
return sprintf(buf, "%d\n", pwm);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
2014-02-12 07:37:01 +01:00
|
|
|
struct max6650_data *data = dev_get_drvdata(dev);
|
|
|
|
struct i2c_client *client = data->client;
|
2012-01-15 06:32:21 +01:00
|
|
|
unsigned long pwm;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = kstrtoul(buf, 10, &pwm);
|
|
|
|
if (err)
|
|
|
|
return err;
|
2007-05-08 17:22:00 +02:00
|
|
|
|
2013-01-09 17:09:34 +01:00
|
|
|
pwm = clamp_val(pwm, 0, 255);
|
2007-05-08 17:22:00 +02:00
|
|
|
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
|
|
|
|
if (data->config & MAX6650_CFG_V12)
|
|
|
|
data->dac = 180 - (180 * pwm)/255;
|
|
|
|
else
|
|
|
|
data->dac = 76 - (76 * pwm)/255;
|
2016-08-24 10:13:26 +02:00
|
|
|
err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);
|
2007-05-08 17:22:00 +02:00
|
|
|
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
|
2016-08-24 10:13:26 +02:00
|
|
|
return err < 0 ? err : count;
|
2007-05-08 17:22:00 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Get/Set controller mode:
|
|
|
|
* Possible values:
|
|
|
|
* 0 = Fan always on
|
|
|
|
* 1 = Open loop, Voltage is set according to speed, not regulated.
|
|
|
|
* 2 = Closed loop, RPM for all fans regulated by fan1 tachometer
|
2016-08-24 10:13:26 +02:00
|
|
|
* 3 = Fan off
|
2007-05-08 17:22:00 +02:00
|
|
|
*/
|
|
|
|
static ssize_t get_enable(struct device *dev, struct device_attribute *devattr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct max6650_data *data = max6650_update_device(dev);
|
|
|
|
int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4;
|
2016-08-24 10:13:26 +02:00
|
|
|
int sysfs_modes[4] = {0, 3, 2, 1};
|
2007-05-08 17:22:00 +02:00
|
|
|
|
|
|
|
return sprintf(buf, "%d\n", sysfs_modes[mode]);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t set_enable(struct device *dev, struct device_attribute *devattr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
2014-02-12 07:37:01 +01:00
|
|
|
struct max6650_data *data = dev_get_drvdata(dev);
|
2012-01-15 06:32:21 +01:00
|
|
|
unsigned long mode;
|
|
|
|
int err;
|
2016-08-24 10:13:26 +02:00
|
|
|
const u8 max6650_modes[] = {
|
|
|
|
MAX6650_CFG_MODE_ON,
|
|
|
|
MAX6650_CFG_MODE_OPEN_LOOP,
|
|
|
|
MAX6650_CFG_MODE_CLOSED_LOOP,
|
|
|
|
MAX6650_CFG_MODE_OFF,
|
|
|
|
};
|
2012-01-15 06:32:21 +01:00
|
|
|
|
|
|
|
err = kstrtoul(buf, 10, &mode);
|
|
|
|
if (err)
|
|
|
|
return err;
|
2007-05-08 17:22:00 +02:00
|
|
|
|
2016-08-24 10:13:26 +02:00
|
|
|
if (mode >= ARRAY_SIZE(max6650_modes))
|
2007-05-08 17:22:00 +02:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
|
2016-08-24 10:13:26 +02:00
|
|
|
max6650_set_operating_mode(data, max6650_modes[mode]);
|
2007-05-08 17:22:00 +02:00
|
|
|
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Read/write functions for fan1_div sysfs file. The MAX6650 has no such
|
|
|
|
* divider. We handle this by converting between divider and counttime:
|
|
|
|
*
|
|
|
|
* (counttime == k) <==> (divider == 2^k), k = 0, 1, 2, or 3
|
|
|
|
*
|
|
|
|
* Lower values of k allow to connect a faster fan without the risk of
|
|
|
|
* counter overflow. The price is lower resolution. You can also set counttime
|
|
|
|
* using the module parameter. Note that the module parameter "prescaler" also
|
|
|
|
* influences the behaviour. Unfortunately, there's no sysfs attribute
|
|
|
|
* defined for that. See the data sheet for details.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static ssize_t get_div(struct device *dev, struct device_attribute *devattr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct max6650_data *data = max6650_update_device(dev);
|
|
|
|
|
|
|
|
return sprintf(buf, "%d\n", DIV_FROM_REG(data->count));
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t set_div(struct device *dev, struct device_attribute *devattr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
2014-02-12 07:37:01 +01:00
|
|
|
struct max6650_data *data = dev_get_drvdata(dev);
|
|
|
|
struct i2c_client *client = data->client;
|
2012-01-15 06:32:21 +01:00
|
|
|
unsigned long div;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = kstrtoul(buf, 10, &div);
|
|
|
|
if (err)
|
|
|
|
return err;
|
2007-05-08 17:22:00 +02:00
|
|
|
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
switch (div) {
|
|
|
|
case 1:
|
|
|
|
data->count = 0;
|
|
|
|
break;
|
|
|
|
case 2:
|
|
|
|
data->count = 1;
|
|
|
|
break;
|
|
|
|
case 4:
|
|
|
|
data->count = 2;
|
|
|
|
break;
|
|
|
|
case 8:
|
|
|
|
data->count = 3;
|
|
|
|
break;
|
|
|
|
default:
|
2009-07-11 13:42:37 +02:00
|
|
|
mutex_unlock(&data->update_lock);
|
2007-05-08 17:22:00 +02:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count);
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2009-06-15 18:39:52 +02:00
|
|
|
/*
|
|
|
|
* Get alarm stati:
|
|
|
|
* Possible values:
|
|
|
|
* 0 = no alarm
|
|
|
|
* 1 = alarm
|
|
|
|
*/
|
|
|
|
|
|
|
|
static ssize_t get_alarm(struct device *dev, struct device_attribute *devattr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
|
|
struct max6650_data *data = max6650_update_device(dev);
|
2014-02-12 07:37:01 +01:00
|
|
|
struct i2c_client *client = data->client;
|
2009-06-15 18:39:52 +02:00
|
|
|
int alarm = 0;
|
|
|
|
|
|
|
|
if (data->alarm & attr->index) {
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
alarm = 1;
|
|
|
|
data->alarm &= ~attr->index;
|
|
|
|
data->alarm |= i2c_smbus_read_byte_data(client,
|
|
|
|
MAX6650_REG_ALARM);
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
return sprintf(buf, "%d\n", alarm);
|
|
|
|
}
|
|
|
|
|
2007-05-08 17:22:00 +02:00
|
|
|
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0);
|
|
|
|
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1);
|
|
|
|
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2);
|
|
|
|
static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3);
|
|
|
|
static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, get_target, set_target);
|
|
|
|
static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_div, set_div);
|
|
|
|
static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, get_enable, set_enable);
|
|
|
|
static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm);
|
2009-06-15 18:39:52 +02:00
|
|
|
static SENSOR_DEVICE_ATTR(fan1_max_alarm, S_IRUGO, get_alarm, NULL,
|
|
|
|
MAX6650_ALRM_MAX);
|
|
|
|
static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, get_alarm, NULL,
|
|
|
|
MAX6650_ALRM_MIN);
|
|
|
|
static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_alarm, NULL,
|
|
|
|
MAX6650_ALRM_TACH);
|
|
|
|
static SENSOR_DEVICE_ATTR(gpio1_alarm, S_IRUGO, get_alarm, NULL,
|
|
|
|
MAX6650_ALRM_GPIO1);
|
|
|
|
static SENSOR_DEVICE_ATTR(gpio2_alarm, S_IRUGO, get_alarm, NULL,
|
|
|
|
MAX6650_ALRM_GPIO2);
|
|
|
|
|
2011-07-24 05:11:19 +02:00
|
|
|
static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a,
|
2009-06-15 18:39:52 +02:00
|
|
|
int n)
|
|
|
|
{
|
|
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
2014-02-12 07:37:01 +01:00
|
|
|
struct max6650_data *data = dev_get_drvdata(dev);
|
|
|
|
struct i2c_client *client = data->client;
|
2009-06-15 18:39:52 +02:00
|
|
|
u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN);
|
|
|
|
struct device_attribute *devattr;
|
2007-05-08 17:22:00 +02:00
|
|
|
|
2009-06-15 18:39:52 +02:00
|
|
|
/*
|
|
|
|
* Hide the alarms that have not been enabled by the firmware
|
|
|
|
*/
|
|
|
|
|
|
|
|
devattr = container_of(a, struct device_attribute, attr);
|
|
|
|
if (devattr == &sensor_dev_attr_fan1_max_alarm.dev_attr
|
|
|
|
|| devattr == &sensor_dev_attr_fan1_min_alarm.dev_attr
|
|
|
|
|| devattr == &sensor_dev_attr_fan1_fault.dev_attr
|
|
|
|
|| devattr == &sensor_dev_attr_gpio1_alarm.dev_attr
|
|
|
|
|| devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) {
|
|
|
|
if (!(alarm_en & to_sensor_dev_attr(devattr)->index))
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return a->mode;
|
|
|
|
}
|
2007-05-08 17:22:00 +02:00
|
|
|
|
|
|
|
static struct attribute *max6650_attrs[] = {
|
|
|
|
&sensor_dev_attr_fan1_input.dev_attr.attr,
|
|
|
|
&dev_attr_fan1_target.attr,
|
|
|
|
&dev_attr_fan1_div.attr,
|
|
|
|
&dev_attr_pwm1_enable.attr,
|
|
|
|
&dev_attr_pwm1.attr,
|
2009-06-15 18:39:52 +02:00
|
|
|
&sensor_dev_attr_fan1_max_alarm.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_fan1_min_alarm.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_fan1_fault.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_gpio1_alarm.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_gpio2_alarm.dev_attr.attr,
|
2007-05-08 17:22:00 +02:00
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
2014-02-12 07:37:01 +01:00
|
|
|
static const struct attribute_group max6650_group = {
|
2007-05-08 17:22:00 +02:00
|
|
|
.attrs = max6650_attrs,
|
2009-06-15 18:39:52 +02:00
|
|
|
.is_visible = max6650_attrs_visible,
|
2007-05-08 17:22:00 +02:00
|
|
|
};
|
|
|
|
|
2011-05-25 20:43:32 +02:00
|
|
|
static struct attribute *max6651_attrs[] = {
|
|
|
|
&sensor_dev_attr_fan2_input.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_fan3_input.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_fan4_input.dev_attr.attr,
|
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
2014-02-12 07:37:01 +01:00
|
|
|
static const struct attribute_group max6651_group = {
|
2011-05-25 20:43:32 +02:00
|
|
|
.attrs = max6651_attrs,
|
|
|
|
};
|
|
|
|
|
2007-05-08 17:22:00 +02:00
|
|
|
/*
|
|
|
|
* Real code
|
|
|
|
*/
|
|
|
|
|
2014-02-12 07:37:01 +01:00
|
|
|
static int max6650_init_client(struct max6650_data *data,
|
|
|
|
struct i2c_client *client)
|
2007-05-08 17:22:00 +02:00
|
|
|
{
|
2014-02-12 07:43:54 +01:00
|
|
|
struct device *dev = &client->dev;
|
2007-05-08 17:22:00 +02:00
|
|
|
int config;
|
|
|
|
int err = -EIO;
|
2016-08-22 08:47:51 +02:00
|
|
|
u32 voltage;
|
|
|
|
u32 prescale;
|
2016-08-24 10:13:26 +02:00
|
|
|
u32 target_rpm;
|
2016-08-22 08:47:51 +02:00
|
|
|
|
|
|
|
if (of_property_read_u32(dev->of_node, "maxim,fan-microvolt",
|
|
|
|
&voltage))
|
|
|
|
voltage = fan_voltage;
|
|
|
|
else
|
|
|
|
voltage /= 1000000; /* Microvolts to volts */
|
|
|
|
if (of_property_read_u32(dev->of_node, "maxim,fan-prescale",
|
|
|
|
&prescale))
|
|
|
|
prescale = prescaler;
|
2007-05-08 17:22:00 +02:00
|
|
|
|
|
|
|
config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
|
|
|
|
|
|
|
|
if (config < 0) {
|
2014-02-12 07:43:54 +01:00
|
|
|
dev_err(dev, "Error reading config, aborting.\n");
|
2007-05-08 17:22:00 +02:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2016-08-22 08:47:51 +02:00
|
|
|
switch (voltage) {
|
2012-01-15 06:32:21 +01:00
|
|
|
case 0:
|
|
|
|
break;
|
|
|
|
case 5:
|
|
|
|
config &= ~MAX6650_CFG_V12;
|
|
|
|
break;
|
|
|
|
case 12:
|
|
|
|
config |= MAX6650_CFG_V12;
|
|
|
|
break;
|
|
|
|
default:
|
2016-08-22 08:47:51 +02:00
|
|
|
dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage);
|
2007-05-08 17:22:00 +02:00
|
|
|
}
|
|
|
|
|
2016-08-22 08:47:51 +02:00
|
|
|
switch (prescale) {
|
2012-01-15 06:32:21 +01:00
|
|
|
case 0:
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
config &= ~MAX6650_CFG_PRESCALER_MASK;
|
|
|
|
break;
|
|
|
|
case 2:
|
|
|
|
config = (config & ~MAX6650_CFG_PRESCALER_MASK)
|
|
|
|
| MAX6650_CFG_PRESCALER_2;
|
|
|
|
break;
|
|
|
|
case 4:
|
|
|
|
config = (config & ~MAX6650_CFG_PRESCALER_MASK)
|
|
|
|
| MAX6650_CFG_PRESCALER_4;
|
|
|
|
break;
|
|
|
|
case 8:
|
|
|
|
config = (config & ~MAX6650_CFG_PRESCALER_MASK)
|
|
|
|
| MAX6650_CFG_PRESCALER_8;
|
|
|
|
break;
|
|
|
|
case 16:
|
|
|
|
config = (config & ~MAX6650_CFG_PRESCALER_MASK)
|
|
|
|
| MAX6650_CFG_PRESCALER_16;
|
|
|
|
break;
|
|
|
|
default:
|
2016-08-22 08:47:51 +02:00
|
|
|
dev_err(dev, "illegal value for prescaler (%d)\n", prescale);
|
2007-05-08 17:22:00 +02:00
|
|
|
}
|
|
|
|
|
2016-08-22 08:47:51 +02:00
|
|
|
dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n",
|
|
|
|
(config & MAX6650_CFG_V12) ? 12 : 5,
|
2007-05-08 17:22:00 +02:00
|
|
|
1 << (config & MAX6650_CFG_PRESCALER_MASK));
|
|
|
|
|
|
|
|
if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) {
|
2014-02-12 07:43:54 +01:00
|
|
|
dev_err(dev, "Config write error, aborting.\n");
|
2007-05-08 17:22:00 +02:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
data->config = config;
|
|
|
|
data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
|
|
|
|
|
2016-08-24 10:13:26 +02:00
|
|
|
if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm",
|
|
|
|
&target_rpm)) {
|
|
|
|
max6650_set_target(data, target_rpm);
|
|
|
|
max6650_set_operating_mode(data, MAX6650_CFG_MODE_CLOSED_LOOP);
|
|
|
|
}
|
|
|
|
|
2007-05-08 17:22:00 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-02-12 07:26:12 +01:00
|
|
|
static int max6650_probe(struct i2c_client *client,
|
|
|
|
const struct i2c_device_id *id)
|
2007-05-08 17:22:00 +02:00
|
|
|
{
|
2014-02-12 07:43:54 +01:00
|
|
|
struct device *dev = &client->dev;
|
2016-08-22 08:47:51 +02:00
|
|
|
const struct of_device_id *of_id =
|
|
|
|
of_match_device(of_match_ptr(max6650_dt_match), dev);
|
2014-02-12 07:26:12 +01:00
|
|
|
struct max6650_data *data;
|
2014-02-12 07:37:01 +01:00
|
|
|
struct device *hwmon_dev;
|
2014-02-12 07:26:12 +01:00
|
|
|
int err;
|
2007-05-08 17:22:00 +02:00
|
|
|
|
2014-02-12 07:43:54 +01:00
|
|
|
data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL);
|
2014-02-12 07:40:33 +01:00
|
|
|
if (!data)
|
2014-02-12 07:26:12 +01:00
|
|
|
return -ENOMEM;
|
2007-05-08 17:22:00 +02:00
|
|
|
|
2014-02-12 07:37:01 +01:00
|
|
|
data->client = client;
|
2014-02-12 07:26:12 +01:00
|
|
|
mutex_init(&data->update_lock);
|
2016-08-22 08:47:51 +02:00
|
|
|
data->nr_fans = of_id ? (int)(uintptr_t)of_id->data : id->driver_data;
|
2007-05-08 17:22:00 +02:00
|
|
|
|
2014-02-12 07:26:12 +01:00
|
|
|
/*
|
|
|
|
* Initialize the max6650 chip
|
|
|
|
*/
|
2014-02-12 07:37:01 +01:00
|
|
|
err = max6650_init_client(data, client);
|
2014-02-12 07:26:12 +01:00
|
|
|
if (err)
|
|
|
|
return err;
|
2009-06-15 18:39:52 +02:00
|
|
|
|
2014-02-12 07:37:01 +01:00
|
|
|
data->groups[0] = &max6650_group;
|
2014-02-12 07:26:12 +01:00
|
|
|
/* 3 additional fan inputs for the MAX6651 */
|
|
|
|
if (data->nr_fans == 4)
|
2014-02-12 07:37:01 +01:00
|
|
|
data->groups[1] = &max6651_group;
|
2014-02-12 07:26:12 +01:00
|
|
|
|
2014-02-12 07:43:54 +01:00
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev,
|
2014-02-12 07:37:01 +01:00
|
|
|
client->name, data,
|
|
|
|
data->groups);
|
|
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
2014-02-12 07:26:12 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
static const struct i2c_device_id max6650_id[] = {
|
|
|
|
{ "max6650", 1 },
|
|
|
|
{ "max6651", 4 },
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, max6650_id);
|
|
|
|
|
|
|
|
static struct i2c_driver max6650_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "max6650",
|
2016-08-22 08:47:51 +02:00
|
|
|
.of_match_table = of_match_ptr(max6650_dt_match),
|
2014-02-12 07:26:12 +01:00
|
|
|
},
|
|
|
|
.probe = max6650_probe,
|
|
|
|
.id_table = max6650_id,
|
|
|
|
};
|
|
|
|
|
2012-01-20 08:38:18 +01:00
|
|
|
module_i2c_driver(max6650_driver);
|
2007-05-08 17:22:00 +02:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Hans J. Koch");
|
|
|
|
MODULE_DESCRIPTION("MAX6650 sensor driver");
|
|
|
|
MODULE_LICENSE("GPL");
|