hwmon: Support for Dallas Semiconductor DS620
Driver for Dallas Semiconductor DS620 temperature sensor and thermostat Signed-off-by: Roland Stigge <stigge@antcom.de> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Roland Stigge
Guenter Roeck
parent
430400b863
commit
6099469805
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@ -0,0 +1,34 @@
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Kernel driver ds620
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===================
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Supported chips:
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* Dallas Semiconductor DS620
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Prefix: 'ds620'
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Datasheet: Publicly available at the Dallas Semiconductor website
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http://www.dalsemi.com/
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Authors:
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Roland Stigge <stigge@antcom.de>
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based on ds1621.c by
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Christian W. Zuckschwerdt <zany@triq.net>
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Description
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-----------
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The DS620 is a (one instance) digital thermometer and thermostat. It has both
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high and low temperature limits which can be user defined (i.e. programmed
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into non-volatile on-chip registers). Temperature range is -55 degree Celsius
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to +125. Between 0 and 70 degree Celsius, accuracy is 0.5 Kelvin. The value
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returned via sysfs displays post decimal positions.
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The thermostat function works as follows: When configured via platform_data
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(struct ds620_platform_data) .pomode == 0 (default), the thermostat output pin
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PO is always low. If .pomode == 1, the thermostat is in PO_LOW mode. I.e., the
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output pin PO becomes active when the temperature falls below temp1_min and
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stays active until the temperature goes above temp1_max.
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Likewise, with .pomode == 2, the thermostat is in PO_HIGH mode. I.e., the PO
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output pin becomes active when the temperature goes above temp1_max and stays
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active until the temperature falls below temp1_min.
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The PO output pin of the DS620 operates active-low.
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@ -274,6 +274,16 @@ config SENSORS_ATXP1
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This driver can also be built as a module. If so, the module
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will be called atxp1.
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config SENSORS_DS620
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tristate "Dallas Semiconductor DS620"
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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 Dallas Semiconductor
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DS620 sensor chip.
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This driver can also be built as a module. If so, the module
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will be called ds620.
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config SENSORS_DS1621
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tristate "Dallas Semiconductor DS1621 and DS1625"
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depends on I2C
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@ -41,6 +41,7 @@ obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
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obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o
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obj-$(CONFIG_SENSORS_PKGTEMP) += pkgtemp.o
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obj-$(CONFIG_SENSORS_DME1737) += dme1737.o
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obj-$(CONFIG_SENSORS_DS620) += ds620.o
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obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
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obj-$(CONFIG_SENSORS_EMC1403) += emc1403.o
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obj-$(CONFIG_SENSORS_EMC2103) += emc2103.o
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@ -0,0 +1,337 @@
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/*
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* ds620.c - Support for temperature sensor and thermostat DS620
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*
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* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
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*
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* based on ds1621.c by Christian W. Zuckschwerdt <zany@triq.net>
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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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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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#include <linux/i2c/ds620.h>
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/*
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* Many DS620 constants specified below
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* 15 14 13 12 11 10 09 08
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* |Done|NVB |THF |TLF |R1 |R0 |AUTOC|1SHOT|
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*
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* 07 06 05 04 03 02 01 00
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* |PO2 |PO1 |A2 |A1 |A0 | | | |
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*/
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#define DS620_REG_CONFIG_DONE 0x8000
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#define DS620_REG_CONFIG_NVB 0x4000
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#define DS620_REG_CONFIG_THF 0x2000
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#define DS620_REG_CONFIG_TLF 0x1000
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#define DS620_REG_CONFIG_R1 0x0800
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#define DS620_REG_CONFIG_R0 0x0400
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#define DS620_REG_CONFIG_AUTOC 0x0200
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#define DS620_REG_CONFIG_1SHOT 0x0100
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#define DS620_REG_CONFIG_PO2 0x0080
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#define DS620_REG_CONFIG_PO1 0x0040
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#define DS620_REG_CONFIG_A2 0x0020
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#define DS620_REG_CONFIG_A1 0x0010
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#define DS620_REG_CONFIG_A0 0x0008
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/* The DS620 registers */
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static const u8 DS620_REG_TEMP[3] = {
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0xAA, /* input, word, RO */
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0xA2, /* min, word, RW */
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0xA0, /* max, word, RW */
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};
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#define DS620_REG_CONF 0xAC /* word, RW */
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#define DS620_COM_START 0x51 /* no data */
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#define DS620_COM_STOP 0x22 /* no data */
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/* Each client has this additional data */
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struct ds620_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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char valid; /* !=0 if following fields are valid */
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unsigned long last_updated; /* In jiffies */
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u16 temp[3]; /* Register values, word */
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};
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/*
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* Temperature registers are word-sized.
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* DS620 uses a high-byte first convention, which is exactly opposite to
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* the SMBus standard.
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*/
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static int ds620_read_temp(struct i2c_client *client, u8 reg)
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{
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int ret;
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ret = i2c_smbus_read_word_data(client, reg);
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if (ret < 0)
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return ret;
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return swab16(ret);
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}
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static int ds620_write_temp(struct i2c_client *client, u8 reg, u16 value)
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{
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return i2c_smbus_write_word_data(client, reg, swab16(value));
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}
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static void ds620_init_client(struct i2c_client *client)
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{
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struct ds620_platform_data *ds620_info = client->dev.platform_data;
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u16 conf, new_conf;
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new_conf = conf =
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swab16(i2c_smbus_read_word_data(client, DS620_REG_CONF));
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/* switch to continuous conversion mode */
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new_conf &= ~DS620_REG_CONFIG_1SHOT;
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/* already high at power-on, but don't trust the BIOS! */
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new_conf |= DS620_REG_CONFIG_PO2;
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/* thermostat mode according to platform data */
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if (ds620_info && ds620_info->pomode == 1)
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new_conf &= ~DS620_REG_CONFIG_PO1; /* PO_LOW */
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else if (ds620_info && ds620_info->pomode == 2)
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new_conf |= DS620_REG_CONFIG_PO1; /* PO_HIGH */
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else
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new_conf &= ~DS620_REG_CONFIG_PO2; /* always low */
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/* with highest precision */
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new_conf |= DS620_REG_CONFIG_R1 | DS620_REG_CONFIG_R0;
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if (conf != new_conf)
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i2c_smbus_write_word_data(client, DS620_REG_CONF,
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swab16(new_conf));
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/* start conversion */
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i2c_smbus_write_byte(client, DS620_COM_START);
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}
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static struct ds620_data *ds620_update_client(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ds620_data *data = i2c_get_clientdata(client);
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struct ds620_data *ret = data;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
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|| !data->valid) {
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int i;
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int res;
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dev_dbg(&client->dev, "Starting ds620 update\n");
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for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
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res = ds620_read_temp(client,
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DS620_REG_TEMP[i]);
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if (res < 0) {
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ret = ERR_PTR(res);
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goto abort;
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}
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data->temp[i] = res;
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}
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data->last_updated = jiffies;
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data->valid = 1;
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}
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static ssize_t show_temp(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct ds620_data *data = ds620_update_client(dev);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%d\n", ((data->temp[attr->index] / 8) * 625) / 10);
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}
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static ssize_t set_temp(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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int res;
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long val;
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct i2c_client *client = to_i2c_client(dev);
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struct ds620_data *data = i2c_get_clientdata(client);
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res = strict_strtol(buf, 10, &val);
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if (res)
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return res;
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val = (val * 10 / 625) * 8;
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mutex_lock(&data->update_lock);
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data->temp[attr->index] = val;
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ds620_write_temp(client, DS620_REG_TEMP[attr->index],
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data->temp[attr->index]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct ds620_data *data = ds620_update_client(dev);
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struct i2c_client *client = to_i2c_client(dev);
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u16 conf, new_conf;
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int res;
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if (IS_ERR(data))
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return PTR_ERR(data);
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/* reset alarms if necessary */
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res = i2c_smbus_read_word_data(client, DS620_REG_CONF);
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if (res < 0)
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return res;
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conf = swab16(res);
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new_conf = conf;
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new_conf &= ~attr->index;
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if (conf != new_conf) {
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res = i2c_smbus_write_word_data(client, DS620_REG_CONF,
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swab16(new_conf));
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if (res < 0)
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return res;
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}
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return sprintf(buf, "%d\n", !!(conf & attr->index));
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2);
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
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DS620_REG_CONFIG_TLF);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
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DS620_REG_CONFIG_THF);
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static struct attribute *ds620_attributes[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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NULL
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};
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static const struct attribute_group ds620_group = {
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.attrs = ds620_attributes,
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};
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static int ds620_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ds620_data *data;
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int err;
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data = kzalloc(sizeof(struct ds620_data), GFP_KERNEL);
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if (!data) {
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err = -ENOMEM;
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goto exit;
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}
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i2c_set_clientdata(client, data);
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mutex_init(&data->update_lock);
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/* Initialize the DS620 chip */
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ds620_init_client(client);
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/* Register sysfs hooks */
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err = sysfs_create_group(&client->dev.kobj, &ds620_group);
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if (err)
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goto exit_free;
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data->hwmon_dev = hwmon_device_register(&client->dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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goto exit_remove_files;
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}
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dev_info(&client->dev, "temperature sensor found\n");
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return 0;
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exit_remove_files:
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sysfs_remove_group(&client->dev.kobj, &ds620_group);
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exit_free:
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kfree(data);
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exit:
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return err;
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}
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static int ds620_remove(struct i2c_client *client)
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{
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struct ds620_data *data = i2c_get_clientdata(client);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &ds620_group);
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kfree(data);
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return 0;
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}
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static const struct i2c_device_id ds620_id[] = {
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{"ds620", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ds620_id);
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/* This is the driver that will be inserted */
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static struct i2c_driver ds620_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "ds620",
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},
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.probe = ds620_probe,
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.remove = ds620_remove,
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.id_table = ds620_id,
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};
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static int __init ds620_init(void)
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{
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return i2c_add_driver(&ds620_driver);
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}
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static void __exit ds620_exit(void)
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{
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i2c_del_driver(&ds620_driver);
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}
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MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
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MODULE_DESCRIPTION("DS620 driver");
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MODULE_LICENSE("GPL");
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module_init(ds620_init);
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module_exit(ds620_exit);
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@ -0,0 +1,21 @@
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#ifndef _LINUX_DS620_H
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#define _LINUX_DS620_H
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#include <linux/types.h>
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#include <linux/i2c.h>
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/* platform data for the DS620 temperature sensor and thermostat */
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struct ds620_platform_data {
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/*
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* Thermostat output pin PO mode:
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* 0 = always low (default)
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* 1 = PO_LOW
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* 2 = PO_HIGH
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*
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* (see Documentation/hwmon/ds620)
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*/
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int pomode;
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};
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#endif /* _LINUX_DS620_H */
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