hwmon: Add Maxim MAX6620 hardware monitoring driver
Add hardware monitoring driver for Maxim MAX6620 Fan controller Originally-from: L. Grunenberg <contact@lgrunenberg.de> Originally-from: Cumulus Networks <support@cumulusnetworks.com> Originally-from: Shuotian Cheng <shuche@microsoft.com> Signed-off-by: Arun Saravanan Balachandran <Arun_Saravanan_Balac@dell.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Arun Saravanan Balachandran
Guenter Roeck
Родитель
d73287eed7
Коммит
e8ac01e5db
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@ -130,6 +130,7 @@ Hardware Monitoring Kernel Drivers
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max31785
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max31790
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max34440
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max6620
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max6639
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max6642
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max6650
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@ -0,0 +1,46 @@
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.. SPDX-License-Identifier: GPL-2.0-or-later
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Kernel driver max6620
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=====================
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Supported chips:
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Maxim MAX6620
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Prefix: 'max6620'
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Addresses scanned: none
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Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6620.pdf
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Authors:
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- L\. Grunenberg <contact@lgrunenberg.de>
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- Cumulus Networks <support@cumulusnetworks.com>
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- Shuotian Cheng <shuche@microsoft.com>
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- Arun Saravanan Balachandran <Arun_Saravanan_Balac@dell.com>
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Description
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-----------
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This driver implements support for Maxim MAX6620 fan controller.
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The driver configures the fan controller in RPM mode. To give the readings more
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range or accuracy, the desired value can be set by a programmable register
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(1, 2, 4, 8, 16 or 32). Set higher values for larger speeds.
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The driver provides the following sensor access in sysfs:
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================ ======= =====================================================
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fan[1-4]_alarm ro Fan alarm.
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fan[1-4]_div rw Sets the nominal RPM range of the fan. Valid values
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are 1, 2, 4, 8, 16 and 32.
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fan[1-4]_input ro Fan speed in RPM.
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fan[1-4]_target rw Desired fan speed in RPM.
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================ ======= =====================================================
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Usage notes
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-----------
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This driver does not auto-detect devices. You will have to instantiate the
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devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
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details.
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@ -1032,6 +1032,16 @@ config SENSORS_MAX31730
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This driver can also be built as a module. If so, the module
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will be called max31730.
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config SENSORS_MAX6620
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tristate "Maxim MAX6620 fan controller"
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depends on I2C
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help
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If you say yes here you get support for the MAX6620
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fan controller.
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This driver can also be built as a module. If so, the module
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will be called max6620.
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config SENSORS_MAX6621
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tristate "Maxim MAX6621 sensor chip"
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depends on I2C
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@ -135,6 +135,7 @@ obj-$(CONFIG_SENSORS_MAX1668) += max1668.o
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obj-$(CONFIG_SENSORS_MAX197) += max197.o
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obj-$(CONFIG_SENSORS_MAX31722) += max31722.o
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obj-$(CONFIG_SENSORS_MAX31730) += max31730.o
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obj-$(CONFIG_SENSORS_MAX6620) += max6620.o
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obj-$(CONFIG_SENSORS_MAX6621) += max6621.o
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obj-$(CONFIG_SENSORS_MAX6639) += max6639.o
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obj-$(CONFIG_SENSORS_MAX6642) += max6642.o
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@ -0,0 +1,514 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for Maxim MAX6620
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*
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* Originally from L. Grunenberg.
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* (C) 2012 by L. Grunenberg <contact@lgrunenberg.de>
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*
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* Copyright (c) 2021 Dell Inc. or its subsidiaries. All Rights Reserved.
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*
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* based on code written by :
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* 2007 by Hans J. Koch <hjk@hansjkoch.de>
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* 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 MAX6620 chip.
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*
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* The datasheet was last seen at:
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*
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* http://pdfserv.maxim-ic.com/en/ds/MAX6620.pdf
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*
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*/
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#include <linux/bits.h>
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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/*
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* MAX 6620 registers
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*/
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#define MAX6620_REG_CONFIG 0x00
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#define MAX6620_REG_FAULT 0x01
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#define MAX6620_REG_CONF_FAN0 0x02
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#define MAX6620_REG_CONF_FAN1 0x03
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#define MAX6620_REG_CONF_FAN2 0x04
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#define MAX6620_REG_CONF_FAN3 0x05
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#define MAX6620_REG_DYN_FAN0 0x06
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#define MAX6620_REG_DYN_FAN1 0x07
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#define MAX6620_REG_DYN_FAN2 0x08
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#define MAX6620_REG_DYN_FAN3 0x09
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#define MAX6620_REG_TACH0 0x10
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#define MAX6620_REG_TACH1 0x12
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#define MAX6620_REG_TACH2 0x14
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#define MAX6620_REG_TACH3 0x16
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#define MAX6620_REG_VOLT0 0x18
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#define MAX6620_REG_VOLT1 0x1A
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#define MAX6620_REG_VOLT2 0x1C
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#define MAX6620_REG_VOLT3 0x1E
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#define MAX6620_REG_TAR0 0x20
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#define MAX6620_REG_TAR1 0x22
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#define MAX6620_REG_TAR2 0x24
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#define MAX6620_REG_TAR3 0x26
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#define MAX6620_REG_DAC0 0x28
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#define MAX6620_REG_DAC1 0x2A
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#define MAX6620_REG_DAC2 0x2C
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#define MAX6620_REG_DAC3 0x2E
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/*
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* Config register bits
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*/
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#define MAX6620_CFG_RUN BIT(7)
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#define MAX6620_CFG_POR BIT(6)
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#define MAX6620_CFG_TIMEOUT BIT(5)
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#define MAX6620_CFG_FULLFAN BIT(4)
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#define MAX6620_CFG_OSC BIT(3)
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#define MAX6620_CFG_WD_MASK (BIT(2) | BIT(1))
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#define MAX6620_CFG_WD_2 BIT(1)
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#define MAX6620_CFG_WD_6 BIT(2)
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#define MAX6620_CFG_WD10 (BIT(2) | BIT(1))
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#define MAX6620_CFG_WD BIT(0)
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/*
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* Failure status register bits
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*/
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#define MAX6620_FAIL_TACH0 BIT(4)
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#define MAX6620_FAIL_TACH1 BIT(5)
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#define MAX6620_FAIL_TACH2 BIT(6)
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#define MAX6620_FAIL_TACH3 BIT(7)
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#define MAX6620_FAIL_MASK0 BIT(0)
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#define MAX6620_FAIL_MASK1 BIT(1)
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#define MAX6620_FAIL_MASK2 BIT(2)
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#define MAX6620_FAIL_MASK3 BIT(3)
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#define MAX6620_CLOCK_FREQ 8192 /* Clock frequency in Hz */
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#define MAX6620_PULSE_PER_REV 2 /* Tachometer pulses per revolution */
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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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static const u8 config_reg[] = {
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MAX6620_REG_CONF_FAN0,
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MAX6620_REG_CONF_FAN1,
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MAX6620_REG_CONF_FAN2,
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MAX6620_REG_CONF_FAN3,
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};
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static const u8 dyn_reg[] = {
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MAX6620_REG_DYN_FAN0,
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MAX6620_REG_DYN_FAN1,
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MAX6620_REG_DYN_FAN2,
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MAX6620_REG_DYN_FAN3,
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};
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static const u8 tach_reg[] = {
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MAX6620_REG_TACH0,
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MAX6620_REG_TACH1,
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MAX6620_REG_TACH2,
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MAX6620_REG_TACH3,
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};
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static const u8 target_reg[] = {
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MAX6620_REG_TAR0,
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MAX6620_REG_TAR1,
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MAX6620_REG_TAR2,
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MAX6620_REG_TAR3,
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};
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/*
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* Client data (each client gets its own)
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*/
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struct max6620_data {
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struct i2c_client *client;
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struct mutex update_lock;
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bool valid; /* false 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 fancfg[4];
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u8 fandyn[4];
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u8 fault;
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u16 tach[4];
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u16 target[4];
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};
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static u8 max6620_fan_div_from_reg(u8 val)
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{
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return BIT((val & 0xE0) >> 5);
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}
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static u16 max6620_fan_rpm_to_tach(u8 div, int rpm)
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{
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return (60 * div * MAX6620_CLOCK_FREQ) / (rpm * MAX6620_PULSE_PER_REV);
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}
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static int max6620_fan_tach_to_rpm(u8 div, u16 tach)
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{
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return (60 * div * MAX6620_CLOCK_FREQ) / (tach * MAX6620_PULSE_PER_REV);
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}
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static int max6620_update_device(struct device *dev)
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{
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struct max6620_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int i;
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int ret = 0;
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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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for (i = 0; i < 4; i++) {
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ret = i2c_smbus_read_byte_data(client, config_reg[i]);
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if (ret < 0)
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goto error;
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data->fancfg[i] = ret;
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ret = i2c_smbus_read_byte_data(client, dyn_reg[i]);
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if (ret < 0)
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goto error;
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data->fandyn[i] = ret;
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ret = i2c_smbus_read_byte_data(client, tach_reg[i]);
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if (ret < 0)
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goto error;
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data->tach[i] = (ret << 3) & 0x7f8;
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ret = i2c_smbus_read_byte_data(client, tach_reg[i] + 1);
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if (ret < 0)
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goto error;
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data->tach[i] |= (ret >> 5) & 0x7;
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ret = i2c_smbus_read_byte_data(client, target_reg[i]);
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if (ret < 0)
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goto error;
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data->target[i] = (ret << 3) & 0x7f8;
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ret = i2c_smbus_read_byte_data(client, target_reg[i] + 1);
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if (ret < 0)
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goto error;
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data->target[i] |= (ret >> 5) & 0x7;
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}
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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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ret = i2c_smbus_read_byte_data(client, MAX6620_REG_FAULT);
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if (ret < 0)
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goto error;
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data->fault |= (ret >> 4) & (ret & 0x0F);
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data->last_updated = jiffies;
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data->valid = true;
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}
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error:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static umode_t
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max6620_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
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int channel)
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{
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switch (type) {
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case hwmon_fan:
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switch (attr) {
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case hwmon_fan_alarm:
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case hwmon_fan_input:
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return 0444;
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case hwmon_fan_div:
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case hwmon_fan_target:
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return 0644;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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static int
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max6620_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
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int channel, long *val)
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{
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struct max6620_data *data;
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struct i2c_client *client;
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int ret;
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u8 div;
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u8 val1;
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u8 val2;
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ret = max6620_update_device(dev);
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if (ret < 0)
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return ret;
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data = dev_get_drvdata(dev);
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client = data->client;
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switch (type) {
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case hwmon_fan:
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switch (attr) {
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case hwmon_fan_alarm:
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mutex_lock(&data->update_lock);
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*val = !!(data->fault & BIT(channel));
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/* Setting TACH count to re-enable fan fault detection */
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if (*val == 1) {
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val1 = (data->target[channel] >> 3) & 0xff;
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val2 = (data->target[channel] << 5) & 0xe0;
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ret = i2c_smbus_write_byte_data(client,
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target_reg[channel], val1);
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if (ret < 0) {
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mutex_unlock(&data->update_lock);
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return ret;
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}
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ret = i2c_smbus_write_byte_data(client,
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target_reg[channel] + 1, val2);
|
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if (ret < 0) {
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mutex_unlock(&data->update_lock);
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return ret;
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}
|
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|
||||
data->fault &= ~BIT(channel);
|
||||
}
|
||||
mutex_unlock(&data->update_lock);
|
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|
||||
break;
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||||
case hwmon_fan_div:
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*val = max6620_fan_div_from_reg(data->fandyn[channel]);
|
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break;
|
||||
case hwmon_fan_input:
|
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if (data->tach[channel] == 0) {
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*val = 0;
|
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} else {
|
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div = max6620_fan_div_from_reg(data->fandyn[channel]);
|
||||
*val = max6620_fan_tach_to_rpm(div, data->tach[channel]);
|
||||
}
|
||||
break;
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||||
case hwmon_fan_target:
|
||||
if (data->target[channel] == 0) {
|
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*val = 0;
|
||||
} else {
|
||||
div = max6620_fan_div_from_reg(data->fandyn[channel]);
|
||||
*val = max6620_fan_tach_to_rpm(div, data->target[channel]);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
max6620_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
|
||||
int channel, long val)
|
||||
{
|
||||
struct max6620_data *data;
|
||||
struct i2c_client *client;
|
||||
int ret;
|
||||
u8 div;
|
||||
u16 tach;
|
||||
u8 val1;
|
||||
u8 val2;
|
||||
|
||||
ret = max6620_update_device(dev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
data = dev_get_drvdata(dev);
|
||||
client = data->client;
|
||||
mutex_lock(&data->update_lock);
|
||||
|
||||
switch (type) {
|
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case hwmon_fan:
|
||||
switch (attr) {
|
||||
case hwmon_fan_div:
|
||||
switch (val) {
|
||||
case 1:
|
||||
div = 0;
|
||||
break;
|
||||
case 2:
|
||||
div = 1;
|
||||
break;
|
||||
case 4:
|
||||
div = 2;
|
||||
break;
|
||||
case 8:
|
||||
div = 3;
|
||||
break;
|
||||
case 16:
|
||||
div = 4;
|
||||
break;
|
||||
case 32:
|
||||
div = 5;
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
goto error;
|
||||
}
|
||||
data->fandyn[channel] &= 0x1F;
|
||||
data->fandyn[channel] |= div << 5;
|
||||
ret = i2c_smbus_write_byte_data(client, dyn_reg[channel],
|
||||
data->fandyn[channel]);
|
||||
break;
|
||||
case hwmon_fan_target:
|
||||
val = clamp_val(val, FAN_RPM_MIN, FAN_RPM_MAX);
|
||||
div = max6620_fan_div_from_reg(data->fandyn[channel]);
|
||||
tach = max6620_fan_rpm_to_tach(div, val);
|
||||
val1 = (tach >> 3) & 0xff;
|
||||
val2 = (tach << 5) & 0xe0;
|
||||
ret = i2c_smbus_write_byte_data(client, target_reg[channel], val1);
|
||||
if (ret < 0)
|
||||
break;
|
||||
ret = i2c_smbus_write_byte_data(client, target_reg[channel] + 1, val2);
|
||||
if (ret < 0)
|
||||
break;
|
||||
|
||||
/* Setting TACH count re-enables fan fault detection */
|
||||
data->fault &= ~BIT(channel);
|
||||
|
||||
break;
|
||||
default:
|
||||
ret = -EOPNOTSUPP;
|
||||
break;
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
ret = -EOPNOTSUPP;
|
||||
break;
|
||||
}
|
||||
|
||||
error:
|
||||
mutex_unlock(&data->update_lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct hwmon_channel_info *max6620_info[] = {
|
||||
HWMON_CHANNEL_INFO(fan,
|
||||
HWMON_F_INPUT | HWMON_F_DIV | HWMON_F_TARGET | HWMON_F_ALARM,
|
||||
HWMON_F_INPUT | HWMON_F_DIV | HWMON_F_TARGET | HWMON_F_ALARM,
|
||||
HWMON_F_INPUT | HWMON_F_DIV | HWMON_F_TARGET | HWMON_F_ALARM,
|
||||
HWMON_F_INPUT | HWMON_F_DIV | HWMON_F_TARGET | HWMON_F_ALARM),
|
||||
NULL
|
||||
};
|
||||
|
||||
static const struct hwmon_ops max6620_hwmon_ops = {
|
||||
.read = max6620_read,
|
||||
.write = max6620_write,
|
||||
.is_visible = max6620_is_visible,
|
||||
};
|
||||
|
||||
static const struct hwmon_chip_info max6620_chip_info = {
|
||||
.ops = &max6620_hwmon_ops,
|
||||
.info = max6620_info,
|
||||
};
|
||||
|
||||
static int max6620_init_client(struct max6620_data *data)
|
||||
{
|
||||
struct i2c_client *client = data->client;
|
||||
int config;
|
||||
int err;
|
||||
int i;
|
||||
int reg;
|
||||
|
||||
config = i2c_smbus_read_byte_data(client, MAX6620_REG_CONFIG);
|
||||
if (config < 0) {
|
||||
dev_err(&client->dev, "Error reading config, aborting.\n");
|
||||
return config;
|
||||
}
|
||||
|
||||
/*
|
||||
* Set bit 4, disable other fans from going full speed on a fail
|
||||
* failure.
|
||||
*/
|
||||
err = i2c_smbus_write_byte_data(client, MAX6620_REG_CONFIG, config | 0x10);
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev, "Config write error, aborting.\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
for (i = 0; i < 4; i++) {
|
||||
reg = i2c_smbus_read_byte_data(client, config_reg[i]);
|
||||
if (reg < 0)
|
||||
return reg;
|
||||
data->fancfg[i] = reg;
|
||||
|
||||
/* Enable RPM mode */
|
||||
data->fancfg[i] |= 0xa8;
|
||||
err = i2c_smbus_write_byte_data(client, config_reg[i], data->fancfg[i]);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
/* 2 counts (001) and Rate change 100 (0.125 secs) */
|
||||
data->fandyn[i] = 0x30;
|
||||
err = i2c_smbus_write_byte_data(client, dyn_reg[i], data->fandyn[i]);
|
||||
if (err < 0)
|
||||
return err;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int max6620_probe(struct i2c_client *client)
|
||||
{
|
||||
struct device *dev = &client->dev;
|
||||
struct max6620_data *data;
|
||||
struct device *hwmon_dev;
|
||||
int err;
|
||||
|
||||
data = devm_kzalloc(dev, sizeof(struct max6620_data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
data->client = client;
|
||||
mutex_init(&data->update_lock);
|
||||
|
||||
err = max6620_init_client(data);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
|
||||
data,
|
||||
&max6620_chip_info,
|
||||
NULL);
|
||||
|
||||
return PTR_ERR_OR_ZERO(hwmon_dev);
|
||||
}
|
||||
|
||||
static const struct i2c_device_id max6620_id[] = {
|
||||
{ "max6620", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, max6620_id);
|
||||
|
||||
static struct i2c_driver max6620_driver = {
|
||||
.class = I2C_CLASS_HWMON,
|
||||
.driver = {
|
||||
.name = "max6620",
|
||||
},
|
||||
.probe_new = max6620_probe,
|
||||
.id_table = max6620_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(max6620_driver);
|
||||
|
||||
MODULE_AUTHOR("Lucas Grunenberg");
|
||||
MODULE_DESCRIPTION("MAX6620 sensor driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
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