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hwmon: Driver for TI TMP102 temperature sensor
Driver for the TI TMP102. The TI TMP102 is similar to the LM75. It differs from the LM75 by having a 16-bit conf register and the temp registers have a minimum resolution of 12 bits; the extended conf register can select 13-bit resolution (which this driver does) and also change the update rate (which this driver currently doesn't use). [JD: Fix tmp102_exit tag, must be __exit, not __init.] Signed-off-by: Steven King <sfking@fdwdc.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Steven King
Jean Delvare
parent
dac6831e67
commit
beb1b6bbf2
27
Documentation/hwmon/tmp102
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27
Documentation/hwmon/tmp102
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@ -0,0 +1,27 @@
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Kernel driver tmp102
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====================
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Supported chips:
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* Texas Instruments TMP102
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Prefix: 'tmp102'
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Addresses scanned: I2C 0x48 0x49 0x4a 0x4b
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Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp102.html
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Author:
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Steven King <sfking@fdwdc.com>
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Description
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-----------
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The Texas Instruments TMP102 implements one temperature sensor. Limits can be
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set through the Overtemperature Shutdown register and Hysteresis register. The
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sensor is accurate to 0.5 degrees over the range of -25 to +85 C, and to 1.0
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degrees from -40 to +125 C. Resolution of the sensor is 0.0625 degree. The
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operating temperature has a minimum of -55 C and a maximum of +150 C.
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The TMP102 has a programmable update rate that can select between 8, 4, 1, and
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0.5 Hz. (Currently the driver only supports the default of 4 Hz).
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The driver provides the common sysfs-interface for temperatures (see
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/Documentation/hwmon/sysfs-interface under Temperatures).
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@ -842,6 +842,16 @@ config SENSORS_THMC50
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This driver can also be built as a module. If so, the module
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will be called thmc50.
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config SENSORS_TMP102
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tristate "Texas Instruments TMP102 and compatibles"
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depends on I2C && EXPERIMENTAL
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help
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If you say yes here you get support for Texas Instruments TMP102
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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 tmp102.
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config SENSORS_TMP401
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tristate "Texas Instruments TMP401 and compatibles"
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depends on I2C && EXPERIMENTAL
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@ -91,6 +91,7 @@ obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o
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obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
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obj-$(CONFIG_SENSORS_AMC6821) += amc6821.o
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obj-$(CONFIG_SENSORS_THMC50) += thmc50.o
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obj-$(CONFIG_SENSORS_TMP102) += tmp102.o
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obj-$(CONFIG_SENSORS_TMP401) += tmp401.o
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obj-$(CONFIG_SENSORS_TMP421) += tmp421.o
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obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
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297
drivers/hwmon/tmp102.c
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297
drivers/hwmon/tmp102.c
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@ -0,0 +1,297 @@
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/* Texas Instruments TMP102 SMBUS temperature sensor driver
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*
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* Copyright 2010 Steven King <sfking@fdwdc.com>
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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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 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/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/delay.h>
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#define DRIVER_NAME "tmp102"
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#define TMP102_TEMP_REG 0x00
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#define TMP102_CONF_REG 0x01
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/* note: these bit definitions are byte swapped */
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#define TMP102_CONF_SD 0x0100
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#define TMP102_CONF_TM 0x0200
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#define TMP102_CONF_POL 0x0400
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#define TMP102_CONF_F0 0x0800
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#define TMP102_CONF_F1 0x1000
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#define TMP102_CONF_R0 0x2000
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#define TMP102_CONF_R1 0x4000
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#define TMP102_CONF_OS 0x8000
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#define TMP102_CONF_EM 0x0010
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#define TMP102_CONF_AL 0x0020
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#define TMP102_CONF_CR0 0x0040
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#define TMP102_CONF_CR1 0x0080
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#define TMP102_TLOW_REG 0x02
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#define TMP102_THIGH_REG 0x03
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struct tmp102 {
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struct device *hwmon_dev;
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struct mutex lock;
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unsigned long last_update;
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int temp[3];
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};
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/* the TMP102 registers are big endian so we have to swab16 the values */
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static int tmp102_read_reg(struct i2c_client *client, u8 reg)
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{
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int result = i2c_smbus_read_word_data(client, reg);
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return result < 0 ? result : swab16(result);
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}
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static int tmp102_write_reg(struct i2c_client *client, u8 reg, u16 val)
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{
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return i2c_smbus_write_word_data(client, reg, swab16(val));
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}
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/* convert left adjusted 13bit TMP102 register value to miliCelsius */
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static int tmp102_reg_to_mC(s16 val)
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{
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return (val * 1000) / 128;
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}
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/* convert miliCelsius to left adjusted 13bit TMP102 register value */
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static u16 tmp102_mC_to_reg(int val)
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{
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return (val * 128) / 1000;
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}
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static const u8 tmp102_reg[] = {
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TMP102_TEMP_REG,
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TMP102_TLOW_REG,
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TMP102_THIGH_REG,
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};
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static struct tmp102 *tmp102_update_device(struct i2c_client *client)
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{
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struct tmp102 *tmp102 = i2c_get_clientdata(client);
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mutex_lock(&tmp102->lock);
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if (time_after(jiffies, tmp102->last_update + HZ / 4)) {
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int i;
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for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) {
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int status = tmp102_read_reg(client, tmp102_reg[i]);
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if (status > -1)
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tmp102->temp[i] = tmp102_reg_to_mC(status);
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}
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tmp102->last_update = jiffies;
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}
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mutex_unlock(&tmp102->lock);
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return tmp102;
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}
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static ssize_t tmp102_show_temp(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev));
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return sprintf(buf, "%d\n", tmp102->temp[sda->index]);
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}
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static ssize_t tmp102_set_temp(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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struct i2c_client *client = to_i2c_client(dev);
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struct tmp102 *tmp102 = i2c_get_clientdata(client);
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long val;
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int status = 0;
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if ((strict_strtol(buf, 10, &val) < 0) || (abs(val) > 150000))
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return -EINVAL;
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mutex_lock(&tmp102->lock);
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if (tmp102->temp[sda->index] != val) {
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tmp102->temp[sda->index] = val;
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status = tmp102_write_reg(client, tmp102_reg[sda->index],
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tmp102_mC_to_reg(val));
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}
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mutex_unlock(&tmp102->lock);
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return status ? : count;
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0);
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static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp,
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tmp102_set_temp, 1);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp,
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tmp102_set_temp, 2);
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static struct attribute *tmp102_attributes[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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NULL
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};
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static const struct attribute_group tmp102_attr_group = {
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.attrs = tmp102_attributes,
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};
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#define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
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#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
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static int __devinit tmp102_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tmp102 *tmp102;
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int status;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_WORD_DATA)) {
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dev_dbg(&client->dev, "adapter doesnt support SMBUS\n");
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return -ENODEV;
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}
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tmp102 = kzalloc(sizeof(*tmp102), GFP_KERNEL);
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if (!tmp102) {
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dev_dbg(&client->dev, "kzalloc failed\n");
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return -ENOMEM;
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}
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i2c_set_clientdata(client, tmp102);
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tmp102_write_reg(client, TMP102_CONF_REG, TMP102_CONFIG);
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status = tmp102_read_reg(client, TMP102_CONF_REG);
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if (status < 0) {
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dev_dbg(&client->dev, "error reading config register\n");
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goto fail0;
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}
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status &= ~TMP102_CONFIG_RD_ONLY;
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if (status != TMP102_CONFIG) {
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dev_dbg(&client->dev, "could not verify config settings\n");
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status = -EIO;
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goto fail0;
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}
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tmp102->last_update = jiffies - HZ;
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mutex_init(&tmp102->lock);
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status = sysfs_create_group(&client->dev.kobj, &tmp102_attr_group);
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if (status) {
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dev_dbg(&client->dev, "could not create sysfs files\n");
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goto fail0;
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}
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tmp102->hwmon_dev = hwmon_device_register(&client->dev);
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if (IS_ERR(tmp102->hwmon_dev)) {
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dev_dbg(&client->dev, "unable to register hwmon device\n");
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status = PTR_ERR(tmp102->hwmon_dev);
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goto fail1;
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}
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dev_info(&client->dev, "initialized\n");
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return 0;
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fail1:
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sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
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fail0:
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i2c_set_clientdata(client, NULL);
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kfree(tmp102);
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return 0;
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}
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static int __devexit tmp102_remove(struct i2c_client *client)
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{
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struct tmp102 *tmp102 = i2c_get_clientdata(client);
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/* shutdown the chip */
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tmp102_write_reg(client, TMP102_CONF_REG, TMP102_CONF_SD);
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hwmon_device_unregister(tmp102->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
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i2c_set_clientdata(client, NULL);
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kfree(tmp102);
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return 0;
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}
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#ifdef CONFIG_PM
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static int tmp102_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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tmp102_write_reg(client, TMP102_CONF_REG, TMP102_CONF_SD);
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return 0;
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}
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static int tmp102_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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tmp102_write_reg(client, TMP102_CONF_REG, TMP102_CONFIG);
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return 0;
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}
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static const struct dev_pm_ops tmp102_dev_pm_ops = {
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.suspend = tmp102_suspend,
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.resume = tmp102_resume,
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};
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#define TMP102_DEV_PM_OPS (&tmp102_dev_pm_ops)
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#else
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#define TMP102_DEV_PM_OPS NULL
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#endif /* CONFIG_PM */
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static const unsigned short normal_i2c[] = {
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0x48, 0x49, 0x4a, 0x4b, I2C_CLIENT_END
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};
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static const struct i2c_device_id tmp102_id[] = {
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{ DRIVER_NAME, 0 },
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{ }
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};
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static struct i2c_driver tmp102_driver = {
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.driver.name = DRIVER_NAME,
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.driver.pm = TMP102_DEV_PM_OPS,
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.class = I2C_CLASS_HWMON,
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.probe = tmp102_probe,
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.remove = __devexit_p(tmp102_remove),
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.id_table = tmp102_id,
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.address_list = normal_i2c,
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};
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static int __init tmp102_init(void)
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{
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return i2c_add_driver(&tmp102_driver);
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}
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module_init(tmp102_init);
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static void __exit tmp102_exit(void)
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{
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i2c_del_driver(&tmp102_driver);
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}
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module_exit(tmp102_exit);
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MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
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MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
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MODULE_LICENSE("GPL");
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