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hwmon: (tmp102) Various fixes

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Fixes from my driver review:
http://lists.lm-sensors.org/pipermail/lm-sensors/2010-March/028051.html

Only the small changes are in there, more important changes will come
later separately as time permits.

* Drop the remnants of the now gone detect function
* The TMP102 has no known compatible chip
* Include the right header files
* Clarify why byte swapping of register values is needed
* Strip resolution info bit from temperature register value
* Set cache lifetime to 1/3 second
* Don't arbitrarily reject limit values; clamp as needed
* Make limit writing unconditional
* Don't check for transaction types the driver doesn't use
* Properly check for error when setting configuration
* Report error on failed probe
* Make the driver load automatically where needed
* Various other minor fixes

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Steven King <sfking@fdwdc.com>
This commit is contained in:
Jean Delvare 2010-05-27 19:58:57 +02:00
parent beb1b6bbf2
commit cff37c9e82
3 changed files with 39 additions and 42 deletions
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9
Documentation/hwmon/tmp102
View file

@ -4,7 +4,7 @@ Kernel driver tmp102
Supported chips:
* Texas Instruments TMP102
Prefix: 'tmp102'
Addresses scanned: I2C 0x48 0x49 0x4a 0x4b
Addresses scanned: none
Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp102.html
Author:
@ -15,13 +15,12 @@ Description
The Texas Instruments TMP102 implements one temperature sensor. Limits can be
set through the Overtemperature Shutdown register and Hysteresis register. The
sensor is accurate to 0.5 degrees over the range of -25 to +85 C, and to 1.0
degrees from -40 to +125 C. Resolution of the sensor is 0.0625 degree. The
sensor is accurate to 0.5 degree over the range of -25 to +85 C, and to 1.0
degree from -40 to +125 C. Resolution of the sensor is 0.0625 degree. The
operating temperature has a minimum of -55 C and a maximum of +150 C.
The TMP102 has a programmable update rate that can select between 8, 4, 1, and
0.5 Hz. (Currently the driver only supports the default of 4 Hz).
The driver provides the common sysfs-interface for temperatures (see
/Documentation/hwmon/sysfs-interface under Temperatures).
Documentation/hwmon/sysfs-interface under Temperatures).

2
drivers/hwmon/Kconfig
View file

@ -843,7 +843,7 @@ config SENSORS_THMC50
will be called thmc50.
config SENSORS_TMP102
tristate "Texas Instruments TMP102 and compatibles"
tristate "Texas Instruments TMP102"
depends on I2C && EXPERIMENTAL
help
If you say yes here you get support for Texas Instruments TMP102

70
drivers/hwmon/tmp102.c
View file

@ -1,6 +1,6 @@
/* Texas Instruments TMP102 SMBUS temperature sensor driver
/* Texas Instruments TMP102 SMBus temperature sensor driver
*
* Copyright 2010 Steven King <sfking@fdwdc.com>
* Copyright (C) 2010 Steven King <sfking@fdwdc.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -17,8 +17,6 @@
* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
@ -27,7 +25,7 @@
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/device.h>
#define DRIVER_NAME "tmp102"
@ -56,26 +54,27 @@ struct tmp102 {
int temp[3];
};
/* the TMP102 registers are big endian so we have to swab16 the values */
static int tmp102_read_reg(struct i2c_client *client, u8 reg)
/* SMBus specifies low byte first, but the TMP102 returns high byte first,
* so we have to swab16 the values */
static inline int tmp102_read_reg(struct i2c_client *client, u8 reg)
{
int result = i2c_smbus_read_word_data(client, reg);
return result < 0 ? result : swab16(result);
}
static int tmp102_write_reg(struct i2c_client *client, u8 reg, u16 val)
static inline int tmp102_write_reg(struct i2c_client *client, u8 reg, u16 val)
{
return i2c_smbus_write_word_data(client, reg, swab16(val));
}
/* convert left adjusted 13bit TMP102 register value to miliCelsius */
static int tmp102_reg_to_mC(s16 val)
/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
static inline int tmp102_reg_to_mC(s16 val)
{
return (val * 1000) / 128;
return ((val & ~0x01) * 1000) / 128;
}
/* convert miliCelsius to left adjusted 13bit TMP102 register value */
static u16 tmp102_mC_to_reg(int val)
/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
static inline u16 tmp102_mC_to_reg(int val)
{
return (val * 128) / 1000;
}
@ -91,7 +90,7 @@ static struct tmp102 *tmp102_update_device(struct i2c_client *client)
struct tmp102 *tmp102 = i2c_get_clientdata(client);
mutex_lock(&tmp102->lock);
if (time_after(jiffies, tmp102->last_update + HZ / 4)) {
if (time_after(jiffies, tmp102->last_update + HZ / 3)) {
int i;
for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) {
int status = tmp102_read_reg(client, tmp102_reg[i]);
@ -122,16 +121,16 @@ static ssize_t tmp102_set_temp(struct device *dev,
struct i2c_client *client = to_i2c_client(dev);
struct tmp102 *tmp102 = i2c_get_clientdata(client);
long val;
int status = 0;
int status;
if ((strict_strtol(buf, 10, &val) < 0) || (abs(val) > 150000))
if (strict_strtol(buf, 10, &val) < 0)
return -EINVAL;
val = SENSORS_LIMIT(val, -256000, 255000);
mutex_lock(&tmp102->lock);
if (tmp102->temp[sda->index] != val) {
tmp102->temp[sda->index] = val;
status = tmp102_write_reg(client, tmp102_reg[sda->index],
tmp102_mC_to_reg(val));
}
tmp102->temp[sda->index] = val;
status = tmp102_write_reg(client, tmp102_reg[sda->index],
tmp102_mC_to_reg(val));
mutex_unlock(&tmp102->lock);
return status ? : count;
}
@ -164,9 +163,10 @@ static int __devinit tmp102_probe(struct i2c_client *client,
struct tmp102 *tmp102;
int status;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WORD_DATA)) {
dev_dbg(&client->dev, "adapter doesnt support SMBUS\n");
dev_err(&client->dev, "adapter doesnt support SMBus word "
"transactions\n");
return -ENODEV;
}
@ -177,16 +177,20 @@ static int __devinit tmp102_probe(struct i2c_client *client,
}
i2c_set_clientdata(client, tmp102);
tmp102_write_reg(client, TMP102_CONF_REG, TMP102_CONFIG);
status = tmp102_write_reg(client, TMP102_CONF_REG, TMP102_CONFIG);
if (status < 0) {
dev_err(&client->dev, "error writing config register\n");
goto fail0;
}
status = tmp102_read_reg(client, TMP102_CONF_REG);
if (status < 0) {
dev_dbg(&client->dev, "error reading config register\n");
dev_err(&client->dev, "error reading config register\n");
goto fail0;
}
status &= ~TMP102_CONFIG_RD_ONLY;
if (status != TMP102_CONFIG) {
dev_dbg(&client->dev, "could not verify config settings\n");
status = -EIO;
dev_err(&client->dev, "config settings did not stick\n");
status = -ENODEV;
goto fail0;
}
tmp102->last_update = jiffies - HZ;
@ -213,7 +217,7 @@ static int __devinit tmp102_probe(struct i2c_client *client,
i2c_set_clientdata(client, NULL);
kfree(tmp102);
return 0;
return status;
}
static int __devexit tmp102_remove(struct i2c_client *client)
@ -260,23 +264,18 @@ static const struct dev_pm_ops tmp102_dev_pm_ops = {
#define TMP102_DEV_PM_OPS NULL
#endif /* CONFIG_PM */
static const unsigned short normal_i2c[] = {
0x48, 0x49, 0x4a, 0x4b, I2C_CLIENT_END
};
static const struct i2c_device_id tmp102_id[] = {
{ DRIVER_NAME, 0 },
{ "tmp102", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tmp102_id);
static struct i2c_driver tmp102_driver = {
.driver.name = DRIVER_NAME,
.driver.pm = TMP102_DEV_PM_OPS,
.class = I2C_CLASS_HWMON,
.probe = tmp102_probe,
.remove = __devexit_p(tmp102_remove),
.id_table = tmp102_id,
.address_list = normal_i2c,
};
static int __init tmp102_init(void)
@ -291,7 +290,6 @@ static void __exit tmp102_exit(void)
}
module_exit(tmp102_exit);
MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
MODULE_LICENSE("GPL");