hwmon: New max6650 driver
This driver supports the Maxim MAX6650 and MAX6651 fan speed monitoring and control chips. Signed-off-by: Hans J. Koch <hjk@linutronix.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Hans-Juergen Koch
Jean Delvare
parent
e84cfbcbe8
commit
d20620de0c
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@ -0,0 +1,53 @@
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Kernel driver max6650
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=====================
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Supported chips:
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* Maxim 6650 / 6651
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Prefix: 'max6650'
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Addresses scanned: I2C 0x1b, 0x1f, 0x48, 0x4b
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Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
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Authors:
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Hans J. Koch <hjk@linutronix.de>
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John Morris <john.morris@spirentcom.com>
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Claus Gindhart <claus.gindhart@kontron.com>
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Description
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-----------
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This driver implements support for the Maxim 6650/6651
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The 2 devices are very similar, but the Maxim 6550 has a reduced feature
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set, e.g. only one fan-input, instead of 4 for the 6651.
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The driver is not able to distinguish between the 2 devices.
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The driver provides the following sensor accesses in sysfs:
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fan1_input ro fan tachometer speed in RPM
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fan2_input ro "
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fan3_input ro "
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fan4_input ro "
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fan1_target rw desired fan speed in RPM (closed loop mode only)
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pwm1_enable rw regulator mode, 0=full on, 1=open loop, 2=closed loop
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pwm1 rw relative speed (0-255), 255=max. speed.
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Used in open loop mode only.
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fan1_div rw sets the speed range the inputs can handle. Legal
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values are 1, 2, 4, and 8. Use lower values for
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faster fans.
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Module parameters
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-----------------
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If your board has a BIOS that initializes the MAX6650/6651 correctly, you can
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simply load your module without parameters. It won't touch the configuration
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registers then. If your board BIOS doesn't initialize the chip, or you want
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different settings, you can set the following parameters:
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voltage_12V: 5=5V fan, 12=12V fan, 0=don't change
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prescaler: Possible values are 1,2,4,8,16, or 0 for don't change
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clock: The clock frequency in Hz of the chip the driver should assume [254000]
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Please have a look at the MAX6650/6651 data sheet and make sure that you fully
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understand the meaning of these parameters before you attempt to change them.
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@ -2304,6 +2304,12 @@ M: vandrove@vc.cvut.cz
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L: linux-fbdev-devel@lists.sourceforge.net (subscribers-only)
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S: Maintained
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MAX6650 HARDWARE MONITOR AND FAN CONTROLLER DRIVER
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P: Hans J. Koch
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M: hjk@linutronix.de
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L: lm-sensors@lm-sensors.org
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S: Maintained
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MEGARAID SCSI DRIVERS
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P: Neela Syam Kolli
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M: Neela.Kolli@engenio.com
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@ -375,6 +375,16 @@ config SENSORS_MAX1619
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This driver can also be built as a module. If so, the module
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will be called max1619.
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config SENSORS_MAX6650
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tristate "Maxim MAX6650 sensor chip"
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depends on HWMON && I2C && EXPERIMENTAL
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help
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If you say yes here you get support for the MAX6650 / MAX6651
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sensor chips.
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This driver can also be built as a module. If so, the module
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will be called max6650.
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config SENSORS_PC87360
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tristate "National Semiconductor PC87360 family"
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depends on HWMON && I2C && EXPERIMENTAL
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@ -43,6 +43,7 @@ obj-$(CONFIG_SENSORS_LM87) += lm87.o
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obj-$(CONFIG_SENSORS_LM90) += lm90.o
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obj-$(CONFIG_SENSORS_LM92) += lm92.o
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obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
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obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
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obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
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obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
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obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o
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@ -0,0 +1,693 @@
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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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* (C) 2007 by Hans J. Koch <hjk@linutronix.de>
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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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* Tha datasheet was last seen at:
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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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/*
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* Addresses to scan. There are four disjoint possibilities, by pin config.
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*/
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static unsigned short normal_i2c[] = {0x1b, 0x1f, 0x48, 0x4b, I2C_CLIENT_END};
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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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/* clock: The clock frequency of the chip the driver should assume */
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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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I2C_CLIENT_INSMOD_1(max6650);
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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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/* 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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static int max6650_attach_adapter(struct i2c_adapter *adapter);
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static int max6650_detect(struct i2c_adapter *adapter, int address, int kind);
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static int max6650_init_client(struct i2c_client *client);
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static int max6650_detach_client(struct i2c_client *client);
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static struct max6650_data *max6650_update_device(struct device *dev);
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/*
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* Driver data (common to all clients)
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*/
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static struct i2c_driver max6650_driver = {
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.driver = {
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.name = "max6650",
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},
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.attach_adapter = max6650_attach_adapter,
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.detach_client = max6650_detach_client,
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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 max6650_data
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{
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struct i2c_client client;
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struct class_device *class_dev;
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struct mutex update_lock;
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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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};
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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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* 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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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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* 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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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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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 i2c_client *client = to_i2c_client(dev);
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struct max6650_data *data = i2c_get_clientdata(client);
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int rpm = simple_strtoul(buf, NULL, 10);
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int kscale, ktach;
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rpm = SENSORS_LIMIT(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
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/*
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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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mutex_lock(&data->update_lock);
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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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i2c_smbus_write_byte_data(client, MAX6650_REG_SPEED, data->speed);
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mutex_unlock(&data->update_lock);
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return count;
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}
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/*
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* Get/set the fan speed in open loop mode using pwm1 sysfs file.
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* Speed is given as a relative value from 0 to 255, where 255 is maximum
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* speed. Note that this is done by writing directly to the chip's DAC,
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* it won't change the closed loop speed set by fan1_target.
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* Also note that due to rounding errors it is possible that you don't read
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* back exactly the value you have set.
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*/
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static ssize_t get_pwm(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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int pwm;
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struct max6650_data *data = max6650_update_device(dev);
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/* Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans.
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Lower DAC values mean higher speeds. */
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if (data->config & MAX6650_CFG_V12)
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pwm = 255 - (255 * (int)data->dac)/180;
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else
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pwm = 255 - (255 * (int)data->dac)/76;
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if (pwm < 0)
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pwm = 0;
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return sprintf(buf, "%d\n", pwm);
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}
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static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct max6650_data *data = i2c_get_clientdata(client);
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int pwm = simple_strtoul(buf, NULL, 10);
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pwm = SENSORS_LIMIT(pwm, 0, 255);
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mutex_lock(&data->update_lock);
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if (data->config & MAX6650_CFG_V12)
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data->dac = 180 - (180 * pwm)/255;
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else
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data->dac = 76 - (76 * pwm)/255;
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i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);
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mutex_unlock(&data->update_lock);
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return count;
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}
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/*
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* Get/Set controller mode:
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* Possible values:
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* 0 = Fan always on
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* 1 = Open loop, Voltage is set according to speed, not regulated.
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* 2 = Closed loop, RPM for all fans regulated by fan1 tachometer
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*/
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static ssize_t get_enable(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 mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4;
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int sysfs_modes[4] = {0, 1, 2, 1};
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return sprintf(buf, "%d\n", sysfs_modes[mode]);
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}
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static ssize_t set_enable(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 i2c_client *client = to_i2c_client(dev);
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struct max6650_data *data = i2c_get_clientdata(client);
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int mode = simple_strtoul(buf, NULL, 10);
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int max6650_modes[3] = {0, 3, 2};
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if ((mode < 0)||(mode > 2)) {
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dev_err(&client->dev,
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"illegal value for pwm1_enable (%d)\n", mode);
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return -EINVAL;
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}
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mutex_lock(&data->update_lock);
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data->config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
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data->config = (data->config & ~MAX6650_CFG_MODE_MASK)
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| (max6650_modes[mode] << 4);
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i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, data->config);
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mutex_unlock(&data->update_lock);
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return count;
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}
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/*
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* 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)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
struct max6650_data *data = i2c_get_clientdata(client);
|
||||
int div = simple_strtoul(buf, NULL, 10);
|
||||
|
||||
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:
|
||||
dev_err(&client->dev,
|
||||
"illegal value for fan divider (%d)\n", div);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count);
|
||||
mutex_unlock(&data->update_lock);
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
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);
|
||||
|
||||
|
||||
static struct attribute *max6650_attrs[] = {
|
||||
&sensor_dev_attr_fan1_input.dev_attr.attr,
|
||||
&sensor_dev_attr_fan2_input.dev_attr.attr,
|
||||
&sensor_dev_attr_fan3_input.dev_attr.attr,
|
||||
&sensor_dev_attr_fan4_input.dev_attr.attr,
|
||||
&dev_attr_fan1_target.attr,
|
||||
&dev_attr_fan1_div.attr,
|
||||
&dev_attr_pwm1_enable.attr,
|
||||
&dev_attr_pwm1.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
static struct attribute_group max6650_attr_grp = {
|
||||
.attrs = max6650_attrs,
|
||||
};
|
||||
|
||||
/*
|
||||
* Real code
|
||||
*/
|
||||
|
||||
static int max6650_attach_adapter(struct i2c_adapter *adapter)
|
||||
{
|
||||
if (!(adapter->class & I2C_CLASS_HWMON)) {
|
||||
dev_dbg(&adapter->dev,
|
||||
"FATAL: max6650_attach_adapter class HWMON not set\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
return i2c_probe(adapter, &addr_data, max6650_detect);
|
||||
}
|
||||
|
||||
/*
|
||||
* The following function does more than just detection. If detection
|
||||
* succeeds, it also registers the new chip.
|
||||
*/
|
||||
|
||||
static int max6650_detect(struct i2c_adapter *adapter, int address, int kind)
|
||||
{
|
||||
struct i2c_client *client;
|
||||
struct max6650_data *data;
|
||||
int err = -ENODEV;
|
||||
|
||||
dev_dbg(&adapter->dev, "max6650_detect called, kind = %d\n", kind);
|
||||
|
||||
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
|
||||
dev_dbg(&adapter->dev, "max6650: I2C bus doesn't support "
|
||||
"byte read mode, skipping.\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!(data = kzalloc(sizeof(struct max6650_data), GFP_KERNEL))) {
|
||||
dev_err(&adapter->dev, "max6650: out of memory.\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
client = &data->client;
|
||||
i2c_set_clientdata(client, data);
|
||||
client->addr = address;
|
||||
client->adapter = adapter;
|
||||
client->driver = &max6650_driver;
|
||||
|
||||
/*
|
||||
* Now we do the remaining detection. A negative kind means that
|
||||
* the driver was loaded with no force parameter (default), so we
|
||||
* must both detect and identify the chip (actually there is only
|
||||
* one possible kind of chip for now, max6650). A zero kind means that
|
||||
* the driver was loaded with the force parameter, the detection
|
||||
* step shall be skipped. A positive kind means that the driver
|
||||
* was loaded with the force parameter and a given kind of chip is
|
||||
* requested, so both the detection and the identification steps
|
||||
* are skipped.
|
||||
*
|
||||
* Currently I can find no way to distinguish between a MAX6650 and
|
||||
* a MAX6651. This driver has only been tried on the former.
|
||||
*/
|
||||
|
||||
if ((kind < 0) &&
|
||||
( (i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG) & 0xC0)
|
||||
||(i2c_smbus_read_byte_data(client, MAX6650_REG_GPIO_STAT) & 0xE0)
|
||||
||(i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN) & 0xE0)
|
||||
||(i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM) & 0xE0)
|
||||
||(i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT) & 0xFC))) {
|
||||
dev_dbg(&adapter->dev,
|
||||
"max6650: detection failed at 0x%02x.\n", address);
|
||||
goto err_free;
|
||||
}
|
||||
|
||||
dev_info(&adapter->dev, "max6650: chip found at 0x%02x.\n", address);
|
||||
|
||||
strlcpy(client->name, "max6650", I2C_NAME_SIZE);
|
||||
mutex_init(&data->update_lock);
|
||||
|
||||
if ((err = i2c_attach_client(client))) {
|
||||
dev_err(&adapter->dev, "max6650: failed to attach client.\n");
|
||||
goto err_free;
|
||||
}
|
||||
|
||||
/*
|
||||
* Initialize the max6650 chip
|
||||
*/
|
||||
if (max6650_init_client(client))
|
||||
goto err_detach;
|
||||
|
||||
err = sysfs_create_group(&client->dev.kobj, &max6650_attr_grp);
|
||||
if (err)
|
||||
goto err_detach;
|
||||
|
||||
data->class_dev = hwmon_device_register(&client->dev);
|
||||
if (!IS_ERR(data->class_dev))
|
||||
return 0;
|
||||
|
||||
err = PTR_ERR(data->class_dev);
|
||||
dev_err(&client->dev, "error registering hwmon device.\n");
|
||||
sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp);
|
||||
err_detach:
|
||||
i2c_detach_client(client);
|
||||
err_free:
|
||||
kfree(data);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int max6650_detach_client(struct i2c_client *client)
|
||||
{
|
||||
struct max6650_data *data = i2c_get_clientdata(client);
|
||||
int err;
|
||||
|
||||
sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp);
|
||||
hwmon_device_unregister(data->class_dev);
|
||||
err = i2c_detach_client(client);
|
||||
if (!err)
|
||||
kfree(data);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int max6650_init_client(struct i2c_client *client)
|
||||
{
|
||||
struct max6650_data *data = i2c_get_clientdata(client);
|
||||
int config;
|
||||
int err = -EIO;
|
||||
|
||||
config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
|
||||
|
||||
if (config < 0) {
|
||||
dev_err(&client->dev, "Error reading config, aborting.\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
switch (fan_voltage) {
|
||||
case 0:
|
||||
break;
|
||||
case 5:
|
||||
config &= ~MAX6650_CFG_V12;
|
||||
break;
|
||||
case 12:
|
||||
config |= MAX6650_CFG_V12;
|
||||
break;
|
||||
default:
|
||||
dev_err(&client->dev,
|
||||
"illegal value for fan_voltage (%d)\n",
|
||||
fan_voltage);
|
||||
}
|
||||
|
||||
dev_info(&client->dev, "Fan voltage is set to %dV.\n",
|
||||
(config & MAX6650_CFG_V12) ? 12 : 5);
|
||||
|
||||
switch (prescaler) {
|
||||
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:
|
||||
dev_err(&client->dev,
|
||||
"illegal value for prescaler (%d)\n",
|
||||
prescaler);
|
||||
}
|
||||
|
||||
dev_info(&client->dev, "Prescaler is set to %d.\n",
|
||||
1 << (config & MAX6650_CFG_PRESCALER_MASK));
|
||||
|
||||
/* If mode is set to "full off", we change it to "open loop" and
|
||||
* set DAC to 255, which has the same effect. We do this because
|
||||
* there's no "full off" mode defined in hwmon specifcations.
|
||||
*/
|
||||
|
||||
if ((config & MAX6650_CFG_MODE_MASK) == MAX6650_CFG_MODE_OFF) {
|
||||
dev_dbg(&client->dev, "Change mode to open loop, full off.\n");
|
||||
config = (config & ~MAX6650_CFG_MODE_MASK)
|
||||
| MAX6650_CFG_MODE_OPEN_LOOP;
|
||||
if (i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, 255)) {
|
||||
dev_err(&client->dev, "DAC write error, aborting.\n");
|
||||
return err;
|
||||
}
|
||||
}
|
||||
|
||||
if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) {
|
||||
dev_err(&client->dev, "Config write error, aborting.\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
data->config = config;
|
||||
data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const u8 tach_reg[] = {
|
||||
MAX6650_REG_TACH0,
|
||||
MAX6650_REG_TACH1,
|
||||
MAX6650_REG_TACH2,
|
||||
MAX6650_REG_TACH3,
|
||||
};
|
||||
|
||||
static struct max6650_data *max6650_update_device(struct device *dev)
|
||||
{
|
||||
int i;
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
struct max6650_data *data = i2c_get_clientdata(client);
|
||||
|
||||
mutex_lock(&data->update_lock);
|
||||
|
||||
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
|
||||
data->speed = i2c_smbus_read_byte_data(client,
|
||||
MAX6650_REG_SPEED);
|
||||
data->config = i2c_smbus_read_byte_data(client,
|
||||
MAX6650_REG_CONFIG);
|
||||
for (i = 0; i < 4; i++) {
|
||||
data->tach[i] = i2c_smbus_read_byte_data(client,
|
||||
tach_reg[i]);
|
||||
}
|
||||
data->count = i2c_smbus_read_byte_data(client,
|
||||
MAX6650_REG_COUNT);
|
||||
data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
|
||||
|
||||
data->last_updated = jiffies;
|
||||
data->valid = 1;
|
||||
}
|
||||
|
||||
mutex_unlock(&data->update_lock);
|
||||
|
||||
return data;
|
||||
}
|
||||
|
||||
static int __init sensors_max6650_init(void)
|
||||
{
|
||||
return i2c_add_driver(&max6650_driver);
|
||||
}
|
||||
|
||||
static void __exit sensors_max6650_exit(void)
|
||||
{
|
||||
i2c_del_driver(&max6650_driver);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Hans J. Koch");
|
||||
MODULE_DESCRIPTION("MAX6650 sensor driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_init(sensors_max6650_init);
|
||||
module_exit(sensors_max6650_exit);
|
||||
Loading…
Reference in New Issue